{"product_id":"mercury-o-ring-25-8m0177478","title":"Mercury – Replacement O-Ring | V12 Verado \/ SeaPro Series | Rubber Seal | 8M0177478","description":"\u003ch2\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Replacement O-Ring | V12 Verado \/ SeaPro Series | Rubber Seal | 8M0177478\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAny boater who’s spent real time on the water knows that the smallest parts often carry the biggest responsibilities. An O-ring doesn’t look impressive, but when it’s sealing a\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e critical system on a Mercury V12, you feel its importance every time you push the throttles forward. That quiet confidence — the kind that lets you run offshore without second-guessing what’s happening under the cowling — starts with components like these. The Mercury 8M0177478 Replacement O-Ring brings that confidence back, giving your V12 the tight, secure seal it was designed to have.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eGenuine Mercury replacement \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eO-ring\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for sealing critical engine components\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eHigh-quality rubber material engineered for \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eheat, pressure, and vibration\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMaintains factory-level sealing performance for demanding marine applications\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eDesigned specifically for Mercury’s \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e7.6L V12 500–600hp\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e platforms\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt and tested to meet Mercury Marine’s original equipment standards\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis Mercury Marine part is designed for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 7.6L V12 600hp Verado\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 7.6L V12 500hp SeaPro\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for owners of:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOffshore center consoles\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHeavy offshore workboats\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHigh-performance coastal fishing vessels\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eLuxury cruisers powered by the V12 platform\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAn O-ring might be simple, but its job is critical: keep air, fuel, or cooling water exactly where it’s meant to be. On a Mercury V12, tolerances are tight and temperatures run high. That means the seal you choose matters. The 8M0177478 O-ring locks into place with a secure, confident feel — not too loose, not too tight — restoring the smooth, reliable sealing you expect from a premium powerplant.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIn real use, a good seal protects overall engine performance. You’ll notice steadier temperature control, fewer small leaks, and better long-term efficiency. It also helps prevent the gradual wear that can come from moisture intrusion or escaping pressure. And because this O-ring meets Mercury’s exact material and fitment specs, you can trust it to hold up through hard acceleration, long idle sessions, and pounding seas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReplac\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eing it is straightforward: remove the old O-ring, clean the surface, and seat the new one evenly. It’s a small step in routine service, but one that keeps your V12 running tight and clean.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWith precision components, the difference between “almost right” and “exactly right” becomes obvious pretty quickly. OEM Me\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ercury Marine parts are engineered for perfect fitment and long-term durability — something generic seals can’t guarantee. A poor O-ring can swell, crack, or flatten, leading to leaks that are inconvenient at best and expensive at worst.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eChoosing OEM means:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerfect compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e with your V12 powerhead\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReliable material quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e meant for high-load marine environments\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePeace of mind\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e knowing the part will last\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eNo guessing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, no sizing issues, no do-overs\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eProtection of your investment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, especially on premium engines like the V12 Verado or SeaPro\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt’s the choice seasoned boaters make when they want things done right the first time.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does this O-ring fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits the Mercury 7.6L V12 500hp SeaPro and 600hp Verado outboards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhat makes this different from an aftermarket O-ring?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e OEM materials are engineered for the V12’s heat, pressure, and vibration. Aftermarket versions often can’t match that durability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I confirm this is the right replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Check your owner’s manual or verify your engine model against the compatibility list above.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Is it safe for both saltwater and freshwater applications?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Y\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ees — it’s built for full marine use in any environment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Most owners familiar with routine maintenance can replace it easily using standard tools.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46940916056355,"sku":"25-8M0177478","price":11.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0177478_Main.jpg?v=1760631447","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-o-ring-25-8m0177478","provider":"PartsVu","version":"1.0","type":"link"}