{"product_id":"mercury-quicksilver-gearcase-drain-screw-3-8-16-unc-threaded-fits-mercury-mercruiser-i-r-mr-alpha-one-tr-trs-22-8m0058389","title":"Mercury – Lower Unit Gear Lube Drain and Fill Hole Screw \u0026 Seal, Magnetic | Gearcase Hardware | Magnetic Steel | 8M0058389","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Lower Unit Gear Lube Drain and Fill Hole Screw \u0026amp; Seal, Magnetic | Gearcase Hardware | Magnetic Steel | 8M0058389\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThere’s a \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecertain\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e kind of comfort that comes from knowing the simplest parts on your boat are the ones you never need to think about. Anyone who’s been around the water long enough knows it’s often the little things — a seal, a plug, a gasket — that keep a good day from turning into a long tow back to the dock. That’s why a dependable lower unit drain and fill screw matters more than most people realize. With the \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury Lower Unit Gear Lube Drain and Fill Hole Screw \u0026amp; Seal (Magnetic)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, you get that quiet reassurance that your gearcase is buttoned up tight, protected from leaks, and shielded from the damage water intrusion can cause.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for use with \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e3\/8-16 drain and fill hole screws\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eFits all MerCruiser sterndrives, Mercury outboards, and Mariner outboards \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eexcept Verado models\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIncludes the required seal to ensure proper seating and leak prevention\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eMagnetic\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e plug attracts ferrous metal shavings to keep them out of circulation\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHelps prevent gear lube loss and protects the gearcase from water intrusion\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt to Mercury Marine OEM specifications for durability and reliability\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCompatible with most Mercury and Mariner outboards (non-Verado)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWorks with many MerCruiser sterndrive models\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommonly used on fishing boats, pontoons, center consoles, runabouts, cruisers, and sport boats\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits gearcases requiring a 3\/8-16 drain and fill screw\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe performance of this small but essential part becomes obvious the moment you service your lower unit. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe screw threads in smoothly, seats firmly, and \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003egives you that\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e satisfying snug fit that \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003etells you\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the seal is doing its job.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Once installed, it holds the gear lube securely inside the case, keeping the system running cool, lubricated, and protected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe magnetic feature is what sets this version apart. As the gears work, tiny metal particles naturally shed — nothing alarming, but enough that you don’t want them floating around in the oil. This screw’s built-in magnet draws those particles in and holds them there. That means cleaner gear lube, smoother operation, and less long-term wear on the gears and bearings. It’s a small detail that quietly adds years of life to a lower unit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhat you’ll feel on the water is simple: a smoother shift, a steady hum, and the peace of mind that comes from knowing the gearcase is sealed tight against water intrusion. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSaltwater\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e or freshwater, it keeps the lower unit protected and ready for another season of hard use.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA g\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eenuine Mercury Marine part isn’t just about brand loyalty — it’s about getting a component designed to fit perfectly and last. Aftermarket screws often use cheaper materials, inconsistent threads, or weaker magnets, which can lead to leaks, stripped housings, or gear wear. OEM means proper fitment, exact tolerances, and engineering built around your specific gearcase. When\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the health of your lower unit depends on a few drops of gear lube staying where they belong, cutting corners isn’t worth it. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e is the practical, proven choice.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does this screw fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt fits most Mercury and Mariner outboards \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eand\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e MerCruiser sterndrives, excluding Verado models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: How is it different from aftermarket drain screws?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e OEM screws offer better sealing, stronger magnets, and precise fitment that generic versions rarely match.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know if this is the correct replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e If your gearcase uses a 3\/8-16 drain and fill screw and is not a Verado, this is the correct part.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely. It’s built for both environments and resists corrosion when properly maintained.\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 Yes — remove the old screw, replace the seal, fill or drain the gear lube as needed, and install this screw snugly.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46941078225187,"sku":"22-8M0058389","price":8.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8m0058389_main.jpg?v=1760631319","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-quicksilver-gearcase-drain-screw-3-8-16-unc-threaded-fits-mercury-mercruiser-i-r-mr-alpha-one-tr-trs-22-8m0058389","provider":"PartsVu","version":"1.0","type":"link"}