{"product_id":"diaphragm-648771","title":"Mercury – Quicksilver Poppet Valve Diaphragm | Cooling System Part | Outboards \u0026 Inboards | 648771","description":"\u003cp data-start=\"0\" data-end=\"104\"\u003e\u003cstrong data-start=\"0\" data-end=\"102\"\u003eMercury – Quicksilver Poppet Valve Diaphragm | Cooling System Part | Outboards \u0026amp; Inboards | 648771\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"106\" data-end=\"109\"\u003e\n\u003ch3 data-start=\"111\" data-end=\"129\"\u003e\u003cstrong data-start=\"115\" data-end=\"127\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"130\" data-end=\"707\"\u003eWhen your outboard starts running hot or your water pressure fluctuates, it’s often the poppet valve diaphragm that needs attention. The \u003cstrong data-start=\"267\" data-end=\"327\"\u003eMercury Marine 648771 Quicksilver Poppet Valve Diaphragm\u003c\/strong\u003e is made to keep your cooling system working smoothly by controlling how water moves through the engine. It’s built for \u003cstrong data-start=\"447\" data-end=\"511\"\u003eMercury and Mariner 75–250HP 2-stroke and 4-stroke outboards\u003c\/strong\u003e, the \u003cstrong data-start=\"517\" data-end=\"530\"\u003eL6 Verado\u003c\/strong\u003e, and select \u003cstrong data-start=\"543\" data-end=\"573\"\u003eMerCruiser inboard engines\u003c\/strong\u003e. Replacing it takes just a few minutes, but it makes a big difference in keeping temperatures steady and preventing long-term wear.\u003c\/p\u003e\n\u003chr data-start=\"709\" data-end=\"712\"\u003e\n\u003ch3 data-start=\"714\" data-end=\"736\"\u003e\u003cstrong data-start=\"718\" data-end=\"734\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"739\" data-end=\"818\"\u003e\n\u003cstrong data-start=\"739\" data-end=\"751\"\u003ePurpose:\u003c\/strong\u003e Regulates cooling pressure to keep your engine from overheating.\u003c\/li\u003e\n\u003cli data-start=\"821\" data-end=\"926\"\u003e\n\u003cstrong data-start=\"821\" data-end=\"834\"\u003eMaterial:\u003c\/strong\u003e Crafted from \u003cstrong data-start=\"848\" data-end=\"880\"\u003eflexible marine-grade rubber\u003c\/strong\u003e that resists salt, heat, and fuel exposure.\u003c\/li\u003e\n\u003cli data-start=\"929\" data-end=\"1012\"\u003e\n\u003cstrong data-start=\"929\" data-end=\"940\"\u003eDesign:\u003c\/strong\u003e Molded precisely to match factory fit and maintain proper water flow.\u003c\/li\u003e\n\u003cli data-start=\"1015\" data-end=\"1107\"\u003e\n\u003cstrong data-start=\"1015\" data-end=\"1031\"\u003ePerformance:\u003c\/strong\u003e Keeps the cooling system balanced for smoother, more efficient operation.\u003c\/li\u003e\n\u003cli data-start=\"1110\" data-end=\"1201\"\u003e\n\u003cstrong data-start=\"1110\" data-end=\"1125\"\u003eDurability:\u003c\/strong\u003e Maintains elasticity and shape through repeated heat and pressure cycles.\u003c\/li\u003e\n\u003cli data-start=\"1204\" data-end=\"1293\"\u003e\n\u003cstrong data-start=\"1204\" data-end=\"1228\"\u003eEase of Replacement:\u003c\/strong\u003e Simple swap with hand tools; valve components sold separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1295\" data-end=\"1298\"\u003e\n\u003ch3 data-start=\"1300\" data-end=\"1337\"\u003e\u003cstrong data-start=\"1304\" data-end=\"1335\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1340\" data-end=\"1389\"\u003eMercury and Mariner 75–250HP 2-stroke outboards\u003c\/li\u003e\n\u003cli data-start=\"1392\" data-end=\"1441\"\u003eMercury and Mariner 75–250HP 4-stroke outboards\u003c\/li\u003e\n\u003cli data-start=\"1444\" data-end=\"1473\"\u003eMercury L6 Verado outboards\u003c\/li\u003e\n\u003cli data-start=\"1476\" data-end=\"1511\"\u003eSelect MerCruiser inboard engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1513\" data-end=\"1516\"\u003e\n\u003ch3 data-start=\"1518\" data-end=\"1561\"\u003e\u003cstrong data-start=\"1522\" data-end=\"1559\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1562\" data-end=\"1907\"\u003eThe \u003cstrong data-start=\"1566\" data-end=\"1586\"\u003e648771 diaphragm\u003c\/strong\u003e is the unsung hero of your cooling system — keeping water flowing when it should and sealing tight when it shouldn’t. A worn or stiff diaphragm can cause poor circulation and rising temperatures, especially under heavy load. Replacing it restores even pressure and consistent cooling performance across all RPM ranges.\u003c\/p\u003e\n\u003cp data-start=\"1909\" data-end=\"2164\"\u003eIts marine-grade rubber holds up to long hours of operation, resisting cracks and stiffness that cheaper materials can’t handle. It’s an inexpensive replacement that helps prevent bigger repairs down the road, keeping your engine healthy and dependable.\u003c\/p\u003e\n\u003chr data-start=\"2166\" data-end=\"2169\"\u003e\n\u003ch3 data-start=\"2171\" data-end=\"2203\"\u003e\u003cstrong data-start=\"2175\" data-end=\"2201\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2204\" data-end=\"2449\"\u003eThe \u003cstrong data-start=\"2208\" data-end=\"2230\"\u003eQuicksilver 648771\u003c\/strong\u003e is a \u003cstrong data-start=\"2236\" data-end=\"2267\"\u003egenuine Mercury Marine part\u003c\/strong\u003e, built specifically for your cooling system’s design. Cheaper versions might not flex correctly or hold their seal under pressure, leading to poor water flow or premature failure.\u003c\/p\u003e\n\u003cp data-start=\"2451\" data-end=\"2682\"\u003eMercury OEM parts are tested for heat resistance, sealing strength, and endurance in real marine environments. They’re made to last — giving you the same dependable cooling and protection your engine had when it left the factory.\u003c\/p\u003e\n\u003chr data-start=\"2684\" data-end=\"2687\"\u003e\n\u003ch3 data-start=\"2689\" data-end=\"2702\"\u003e\u003cstrong data-start=\"2693\" data-end=\"2700\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2704\" data-end=\"2860\"\u003e\u003cstrong data-start=\"2704\" data-end=\"2739\"\u003eQ1: What engines does this fit?\u003c\/strong\u003e\u003cbr data-start=\"2739\" data-end=\"2742\"\u003eIt fits \u003cstrong data-start=\"2750\" data-end=\"2806\"\u003eMercury and Mariner 75–250HP 2- \u0026amp; 4-stroke outboards\u003c\/strong\u003e, \u003cstrong data-start=\"2808\" data-end=\"2821\"\u003eL6 Verado\u003c\/strong\u003e, and \u003cstrong data-start=\"2827\" data-end=\"2857\"\u003eMerCruiser inboard engines\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2862\" data-end=\"2994\"\u003e\u003cstrong data-start=\"2862\" data-end=\"2886\"\u003eQ2: What does it do?\u003c\/strong\u003e\u003cbr data-start=\"2886\" data-end=\"2889\"\u003eIt regulates cooling water flow by controlling the poppet valve’s operation, keeping pressure balanced.\u003c\/p\u003e\n\u003cp data-start=\"2996\" data-end=\"3105\"\u003e\u003cstrong data-start=\"2996\" data-end=\"3024\"\u003eQ3: What’s it made from?\u003c\/strong\u003e\u003cbr data-start=\"3024\" data-end=\"3027\"\u003eA \u003cstrong data-start=\"3029\" data-end=\"3056\"\u003ehigh-flex marine rubber\u003c\/strong\u003e that holds up under heat, water, and pressure.\u003c\/p\u003e\n\u003cp data-start=\"3107\" data-end=\"3253\"\u003e\u003cstrong data-start=\"3107\" data-end=\"3141\"\u003eQ4: How hard is it to install?\u003c\/strong\u003e\u003cbr data-start=\"3141\" data-end=\"3144\"\u003eIt’s quick and straightforward — just remove the valve cover and replace the diaphragm with standard tools.\u003c\/p\u003e\n\u003cp data-start=\"3255\" data-end=\"3403\"\u003e\u003cstrong data-start=\"3255\" data-end=\"3286\"\u003eQ5: Why choose Mercury OEM?\u003c\/strong\u003e\u003cbr data-start=\"3286\" data-end=\"3289\"\u003eOEM parts fit exactly, last longer, and maintain the right water pressure and flow your system was designed for.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626575192355,"sku":"648771","price":8.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/648771_Main.jpg?v=1760631165","url":"https:\/\/partsvu.com\/en-ca\/products\/diaphragm-648771","provider":"PartsVu","version":"1.0","type":"link"}