{"product_id":"mercury-mercruiser-water-shutter-2-50-inch-diameter-807166a3","title":"Mercury – Quicksilver Water Shutter | For Select MerCruiser Sterndrive Engines | 807166A3","description":"\u003cp data-start=\"0\" data-end=\"95\"\u003e\u003cstrong data-start=\"0\" data-end=\"93\"\u003eMercury – Quicksilver Water Shutter | For Select MerCruiser Sterndrive Engines | 807166A3\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"97\" data-end=\"100\"\u003e\n\u003ch3 data-start=\"102\" data-end=\"120\"\u003e\u003cstrong data-start=\"106\" data-end=\"118\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"121\" data-end=\"697\"\u003eWhen the water gets rough, your engine needs protection from the backflow that can sneak up the exhaust system. The \u003cstrong data-start=\"237\" data-end=\"290\"\u003eMercury Marine 807166A3 Quicksilver Water Shutter\u003c\/strong\u003e—sometimes called a water flapper—does exactly that. Designed for \u003cstrong data-start=\"356\" data-end=\"397\"\u003evarious MerCruiser sterndrive engines\u003c\/strong\u003e, this simple but vital part closes automatically when the engine is shut off or idling to stop water from washing back into the cylinders. It’s durable, reliable, and built to handle years of exposure to exhaust heat and saltwater — a quiet safeguard that keeps your motor safe and running strong.\u003c\/p\u003e\n\u003chr data-start=\"699\" data-end=\"702\"\u003e\n\u003ch3 data-start=\"704\" data-end=\"726\"\u003e\u003cstrong data-start=\"708\" data-end=\"724\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"729\" data-end=\"823\"\u003e\n\u003cstrong data-start=\"729\" data-end=\"741\"\u003ePurpose:\u003c\/strong\u003e Prevents water from backing up into the exhaust system when idling or shut off.\u003c\/li\u003e\n\u003cli data-start=\"826\" data-end=\"930\"\u003e\n\u003cstrong data-start=\"826\" data-end=\"837\"\u003eDesign:\u003c\/strong\u003e Functions as a \u003cstrong data-start=\"853\" data-end=\"877\"\u003eflexible check valve\u003c\/strong\u003e — opens for exhaust flow, closes against backwash.\u003c\/li\u003e\n\u003cli data-start=\"933\" data-end=\"1026\"\u003e\n\u003cstrong data-start=\"933\" data-end=\"941\"\u003eFit:\u003c\/strong\u003e \u003cstrong data-start=\"942\" data-end=\"980\"\u003e2.5-inch diameter at the hinge pin\u003c\/strong\u003e; installs inline within the exhaust system.\u003c\/li\u003e\n\u003cli data-start=\"1029\" data-end=\"1123\"\u003e\n\u003cstrong data-start=\"1029\" data-end=\"1044\"\u003eDurability:\u003c\/strong\u003e Made from \u003cstrong data-start=\"1055\" data-end=\"1098\"\u003eheat- and corrosion-resistant materials\u003c\/strong\u003e for long service life.\u003c\/li\u003e\n\u003cli data-start=\"1126\" data-end=\"1212\"\u003e\n\u003cstrong data-start=\"1126\" data-end=\"1140\"\u003ePlacement:\u003c\/strong\u003e Mounts downstream of the flexible union between the elbow and Y-pipe.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1214\" data-end=\"1217\"\u003e\n\u003ch3 data-start=\"1219\" data-end=\"1256\"\u003e\u003cstrong data-start=\"1223\" data-end=\"1254\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1259\" data-end=\"1366\"\u003eFits \u003cstrong data-start=\"1264\" data-end=\"1311\"\u003evarious MerCruiser sterndrive installations\u003c\/strong\u003e (check owner’s or service manual for exact fitment).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1368\" data-end=\"1371\"\u003e\n\u003ch3 data-start=\"1373\" data-end=\"1416\"\u003e\u003cstrong data-start=\"1377\" data-end=\"1414\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1417\" data-end=\"1721\"\u003eThe \u003cstrong data-start=\"1421\" data-end=\"1447\"\u003e807166A3 water shutter\u003c\/strong\u003e quietly protects your MerCruiser engine every time you shut it down. When the boat is stopped or reversing in waves, this flapper closes to stop seawater from being forced back up the exhaust system — protecting the engine from corrosion, internal rust, or hydro-locking.\u003c\/p\u003e\n\u003cp data-start=\"1723\" data-end=\"2046\"\u003eMade from high-strength materials, this shutter is built to handle the punishing mix of heat, moisture, and vibration that comes with marine exhaust systems. It installs quickly, fits snugly, and once it’s in place, you won’t have to think about it — just enjoy the confidence that comes with knowing your engine is safe.\u003c\/p\u003e\n\u003chr data-start=\"2048\" data-end=\"2051\"\u003e\n\u003ch3 data-start=\"2053\" data-end=\"2085\"\u003e\u003cstrong data-start=\"2057\" data-end=\"2083\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2086\" data-end=\"2370\"\u003eThe \u003cstrong data-start=\"2090\" data-end=\"2114\"\u003eQuicksilver 807166A3\u003c\/strong\u003e is a \u003cstrong data-start=\"2120\" data-end=\"2151\"\u003egenuine Mercury Marine part\u003c\/strong\u003e, engineered for precision fit and lasting reliability. Generic replacements can use cheaper plastics or rubber that harden, crack, or warp from exhaust heat, which can cause early failure and potential engine damage.\u003c\/p\u003e\n\u003cp data-start=\"2372\" data-end=\"2615\"\u003eMercury’s OEM design is built to handle real-world marine conditions, providing consistent performance and protection over time. It’s the same part Mercury installs on new sterndrives — tested, proven, and trusted by professionals worldwide.\u003c\/p\u003e\n\u003chr data-start=\"2617\" data-end=\"2620\"\u003e\n\u003ch3 data-start=\"2622\" data-end=\"2635\"\u003e\u003cstrong data-start=\"2626\" data-end=\"2633\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2637\" data-end=\"2805\"\u003e\u003cstrong data-start=\"2637\" data-end=\"2674\"\u003eQ1: What does a water shutter do?\u003c\/strong\u003e\u003cbr data-start=\"2674\" data-end=\"2677\"\u003eIt prevents water from flowing backward through the exhaust system into the engine during idling, reversing, or when shut off.\u003c\/p\u003e\n\u003cp data-start=\"2807\" data-end=\"2916\"\u003e\u003cstrong data-start=\"2807\" data-end=\"2847\"\u003eQ2: What’s the size of this shutter?\u003c\/strong\u003e\u003cbr data-start=\"2847\" data-end=\"2850\"\u003eIt measures \u003cstrong data-start=\"2862\" data-end=\"2888\"\u003e2.5 inches in diameter\u003c\/strong\u003e at the cross pin (hinge).\u003c\/p\u003e\n\u003cp data-start=\"2918\" data-end=\"3046\"\u003e\u003cstrong data-start=\"2918\" data-end=\"2948\"\u003eQ3: Where is it installed?\u003c\/strong\u003e\u003cbr data-start=\"2948\" data-end=\"2951\"\u003eInside the exhaust system, downstream of the flexible union between the \u003cstrong data-start=\"3023\" data-end=\"3043\"\u003eelbow and Y-pipe\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"3048\" data-end=\"3177\"\u003e\u003cstrong data-start=\"3048\" data-end=\"3081\"\u003eQ4: When should I replace it?\u003c\/strong\u003e\u003cbr data-start=\"3081\" data-end=\"3084\"\u003eReplace it if it’s \u003cstrong data-start=\"3103\" data-end=\"3133\"\u003ecracked, stiff, or missing\u003c\/strong\u003e, or during exhaust maintenance intervals.\u003c\/p\u003e\n\u003cp data-start=\"3179\" data-end=\"3401\"\u003e\u003cstrong data-start=\"3179\" data-end=\"3218\"\u003eQ5: Why OEM instead of aftermarket?\u003c\/strong\u003e\u003cbr data-start=\"3218\" data-end=\"3221\"\u003eBecause \u003cstrong data-start=\"3229\" data-end=\"3253\"\u003eMercury OEM shutters\u003c\/strong\u003e are made from high-temp, corrosion-resistant materials that hold up under the real stresses of boating — ensuring long-lasting engine protection.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46936191533347,"sku":"807166A3","price":100.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/807166a3_04-1.jpg?v=1761571361","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-mercruiser-water-shutter-2-50-inch-diameter-807166a3","provider":"PartsVu","version":"1.0","type":"link"}