{"product_id":"12644a1-4-inch-external-exhaust-flapper-kit-fits-mercruiser-4-inch-od-through-transom-exhaust-outlets-replaces-12644q01-18-4457-89250","title":"12644A1 4-Inch External Exhaust Flapper Kit · Fits MerCruiser 4-inch OD through-transom exhaust outlets, Replaces 12644Q01, 18-4457, 89250","description":"\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e12644A1 4-Inch External Exhaust Flapper Kit · Fits MerCruiser 4-inch OD through-transom exhaust outlets, Replaces 12644Q01, 18-4457, 89250\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eGHMarine 4-inch external exhaust flapper kit\u003c\/span\u003e\u003c\/b\u003e for \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003ethrough-transom\u003c\/span\u003e\u003c\/b\u003e exhaust outlets with \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e4-inch OD\u003c\/span\u003e\u003c\/b\u003e. Replaces OEM \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e12644A1\u003c\/span\u003e\u003c\/b\u003e (also \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e12644Q01\u003c\/span\u003e\u003c\/b\u003e) and cross-refs \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e18-4457\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e89250\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e9-44001\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e509495\u003c\/span\u003e\u003c\/b\u003e. This is an \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eexternal flapper\u003c\/span\u003e\u003c\/b\u003e on the hull outlet — \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003enot\u003c\/span\u003e\u003c\/b\u003e a rubber bellow and \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003enot\u003c\/span\u003e\u003c\/b\u003e a Y-pipe internal water shutter (807166A1 \/ A2 \/ A3).\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eCatalog \/ service packaging for this family is typically \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e1 flapper + 1 clamp\u003c\/span\u003e\u003c\/b\u003e. Confirm the exact contents against your package photo \/ packing slip before install — do not assume a multi-pack.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eWhich flapper is this?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eThis is the rubber flapper that mounts on a through-transom external exhaust outlet. When the engine stops or following seas push water toward the outlet, the flapper helps limit water backing up the exhaust path.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eIt is \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003enot\u003c\/span\u003e\u003c\/b\u003e a sterndrive exhaust bellow (e.g. 8M0124227), \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003enot\u003c\/span\u003e\u003c\/b\u003e a 3-inch external flapper (34765A1 \/ 89240 family), \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003enot\u003c\/span\u003e\u003c\/b\u003e a 5\/6-inch external flapper (89260 family — GH 23EF445), and \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003enot\u003c\/span\u003e\u003c\/b\u003e a Y-pipe internal shutter (807166A1\/A2\/A3 — GH 17ST00x).\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eSigns yours is due\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cul style=\"margin:0.4em 0;padding-left:1.25em;font-size:14px;font-family:'Calibri',sans-serif;\"\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eMeasure the through-transom exhaust outlet OD at about 4 inches — the external rubber flapper is cracked, missing, or stuck open\/closed.\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eIn reverse or following seas, water burps back into the 4-inch outlet path (not the engine-bay 807166A* Y-pipe shutter family).\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eExternal clamp on the 4-inch outlet is rusted through; the flapper hangs loose or has fallen away from the tip.\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eDivert: outlet measures 5 or 6 inches → GH 23EF445 (89260), not this 4-inch kit. You need a bellow, not a tip flapper → leave this page.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eWill it fit my drive?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eThis kit is Compatible with marine through-transom external exhaust outlets where the outlet OD is \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e4 inch\u003c\/span\u003e\u003c\/b\u003e and the old part \/ catalog number falls in the \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e12644A1\u003c\/span\u003e\u003c\/b\u003e family. \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eEngine horsepower alone does not prove fit\u003c\/span\u003e\u003c\/b\u003e — measure the outlet OD and match the old number.\u003c\/span\u003e\u003c\/p\u003e\u003ctable style=\"border-collapse:collapse;border:none;width:100%;margin:14px 0;mso-table-layout-alt:fixed;\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\" width=\"100%\" class=\"MsoTableGrid\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eBrand\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eModel \/ Drive\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eRated HP\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eStroke\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eYears\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eOEM Part No.\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eMerCruiser \/ Mercury\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eThrough-transom external exhaust · 4-inch OD outlet\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eOutlet-OD-driven\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eN\/A\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eBy hull outlet \/ old part — not HP\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e12644A1 \/ 12644Q01\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eIf your outlet is 3 inch or 5\/6 inch, or your old shutter is an 807166A* Y-pipe piece, stop — this listing is the wrong family.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eOEM \u0026amp; swap numbers\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003ePrimary OEM is \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e12644A1\u003c\/span\u003e\u003c\/b\u003e. Service \/ packaging parallel number \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e12644Q01\u003c\/span\u003e\u003c\/b\u003e. Cross-ref numbers below identify the same 4-inch external flapper family.\u003c\/span\u003e\u003c\/p\u003e\u003ctable style=\"border-collapse:collapse;border:none;width:100%;margin:14px 0;mso-table-layout-alt:fixed;\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\" width=\"100%\" class=\"MsoTableGrid\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eType\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003ePart Number\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#292F36;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;color:white;\"\u003eNotes\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eOEM\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e12644A1\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003ePrimary · 4-inch external exhaust flapper kit\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eOEM \/ service\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e12644Q01\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eParallel service \/ packaging number\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eCross-ref\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e18-4457\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e4-inch external flapper · ~101.6 mm\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eCross-ref\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e89250\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e4-inch external water shutter family\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eCross-ref\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e9-44001\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e4-inch exhaust flapper cross-ref\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003eCross-ref\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e509495\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"border:solid windowtext 1.0pt;background:#f5f5f5;padding:1.0pt 1.8pt 1.0pt 1.8pt;vertical-align:top;white-space:nowrap;\" nowrap\u003e\u003cp style=\"margin:0;line-height:normal;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:8.0pt;font-family:'Calibri',sans-serif;\"\u003e4-inch external water shutter cross-ref\u003c\/span\u003e\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eWrong part? Read before you order\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cul style=\"margin:0.4em 0;padding-left:1.25em;font-size:14px;font-family:'Calibri',sans-serif;\"\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNOT a 3-inch external flapper (\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e34765A1\u003c\/span\u003e\u003c\/b\u003e \/ \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e89240\u003c\/span\u003e\u003c\/b\u003e family)\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNOT a 5\/6-inch external flapper (\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e89260\u003c\/span\u003e\u003c\/b\u003e — GH \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e23EF445\u003c\/span\u003e\u003c\/b\u003e)\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNOT a Y-pipe internal water shutter (\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e807166A1\u003c\/span\u003e\u003c\/b\u003e \/ \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e807166A2\u003c\/span\u003e\u003c\/b\u003e \/ \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e807166A3\u003c\/span\u003e\u003c\/b\u003e — GH 17ST00x)\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNOT a rubber exhaust bellow \/ transom boot (\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e8M0124227\u003c\/span\u003e\u003c\/b\u003e \/ \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e18654A1\u003c\/span\u003e\u003c\/b\u003e — GH 17B1003)\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNOT a default 2-pack — official 12644A1 family is a single-outlet kit\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eWhat ships in the box\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cul style=\"margin:0.4em 0;padding-left:1.25em;font-size:14px;font-family:'Calibri',sans-serif;\"\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003e1 × 4-inch external exhaust flapper (12644A1 family)\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eClamp: catalog\/service packaging for this family typically includes 1 clamp — confirm against your package before install\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eOften ordered with related SKUs\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cul style=\"margin:0.4em 0;padding-left:1.25em;font-size:14px;font-family:'Calibri',sans-serif;\"\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNeed 5\/6-inch external flapper → GH \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e23EF445\u003c\/span\u003e\u003c\/b\u003e (89260 family)\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNeed Y-pipe internal shutters 807166A3 → GH \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e17ST004\u003c\/span\u003e\u003c\/b\u003e \/ \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e17ST005\u003c\/span\u003e\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNeed twin-engine 4-inch bellows + A3 shutters → GH \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e18BS002\u003c\/span\u003e\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eNeed transom exhaust bellow → GH \u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003e17B1003\u003c\/span\u003e\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eInstall tips on the through-transom outlet\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003e\u003ci\u003eExternal hull outlet work. If you are not comfortable working at the transom exhaust outlet, use a marine shop. Do NOT use bellows adhesive or a bellows expander — those are for rubber bellow boots, not this flapper.\u003c\/i\u003e\u003c\/span\u003e\u003c\/p\u003e\u003col style=\"margin:0.4em 0;padding-left:1.35em;font-size:14px;font-family:'Calibri',sans-serif;\"\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eConfirm outlet OD is 4 inch and the old number is in the 12644A1 family (not 3 inch \/ 5-6 inch \/ 807166A*).\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eRemove the old flapper and clamp; clean the outlet lip.\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eSeat the new flapper fully on the outlet; install the clamp if supplied in your package; tighten securely.\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eCheck free movement of the flapper — it must open with exhaust flow and close when reverse water pressure hits the outlet.\u003c\/li\u003e\n\u003cli style=\"margin:0.3em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\"\u003eRun and inspect for spray \/ leaks at the outlet before returning the boat to service.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eFAQ\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eIs this a bellow or a flapper?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eFlapper only. It mounts on a through-transom external exhaust outlet. It is not a sterndrive exhaust bellow and does not use bellows adhesive or an expander tool.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eWill it fit my 5.7 \/ 7.4 MerCruiser?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eOnly if the through-transom outlet OD is 4 inch and the old part is in the 12644A1 family. Horsepower alone does not prove fit — measure the outlet.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eIs this the same as 807166A1 \/ A2 \/ A3?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eNo. Those are Y-pipe internal water shutters. This SKU is an external through-transom flapper on the hull outlet.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eIs this the same as 89260?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eNo. 89260 is the 5\/6-inch external flapper family (GH 23EF445). This listing is 4-inch only.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eWhat comes in the box?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eOne 4-inch external flapper. Catalog packaging for 12644A1 typically also includes one clamp — confirm against your package photo \/ packing slip.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003eDo I need bellows adhesive?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eNo. That is for rubber bellow boots such as GH 17B1003. This flapper seats on the outlet and is retained with a clamp when supplied.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"color:#ff7c40;font-family:'Calibri',sans-serif;font-size:14px;\"\u003ePlease note\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp style=\"margin:0.4em 0;line-height:1.55;font-size:14px;font-family:'Calibri',sans-serif;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:'Calibri',sans-serif;font-size:14px;\"\u003eAftermarket replacement part. Not affiliated with engine manufacturers named above. \"Compatible with\", \"Replaces\", and cross-ref numbers identify the 4-inch external flapper family — always confirm outlet OD, old part number, and package contents before ordering.\u003c\/span\u003e\u003c\/p\u003e","brand":"GHMarine","offers":[{"title":"Default Title","offer_id":51289106120950,"sku":"19B1002","price":0.0,"currency_code":"USD","in_stock":false}],"url":"https:\/\/gh-marine.com\/products\/12644a1-4-inch-external-exhaust-flapper-kit-fits-mercruiser-4-inch-od-through-transom-exhaust-outlets-replaces-12644q01-18-4457-89250","provider":"GH Marine","version":"1.0","type":"link"}