{"product_id":"sierra-18-2371-lower-unit-drain-screw-for-yamaha-outboards-replaces-688-45341-m8-1-25-thread","title":"Sierra Drain Screw 18-2371, M8-1.25 Thread, Replaces 688-45341-00-00, Pack of 50","description":"\u003cp\u003eThe Sierra Drain Screw 18-2371 is an M8-1.25 thread drain screw used to seal the drain and fill ports on marine lower units and gearcases. It is sold in a pack of 50, making it a practical stock item for shops, marinas, and service techs who perform routine gear lube changes and need a reliable supply of correctly sized screws on hand. The screw pairs with Sierra Gasket 18-4698, which creates the seal against the housing and should be replaced along with the screw each time the drain or fill plug is removed to prevent gear lube leaks. Installing a proper drain screw with a fresh gasket is a small but critical step in gearcase maintenance, since a worn or damaged sealing surface can allow lubricant to seep out or water to enter the housing, leading to costly internal damage. This part number is intended as a direct equivalent for the OEM numbers listed below, so it can be used as a drop-in replacement when servicing units originally fitted with those screws. Keeping a supply of these screws and matching gaskets on hand simplifies routine maintenance and helps ensure a proper, leak-free seal every time a lower unit is drained or refilled.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2371\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e M8-1.25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 50\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Gasket:\u003c\/strong\u003e Sierra 18-4698\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282185541\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 688-45341-00-00, 688-45341-10-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e688-45341-00-00\u003c\/li\u003e\n\u003cli\u003e688-45341-10-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size is the Sierra 18-2371 drain screw?\u003c\/strong\u003e The Sierra 18-2371 drain screw has an M8-1.25 thread.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many screws come in a pack?\u003c\/strong\u003e Sierra 18-2371 is sold in a pack of 50 drain screws.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2371 come with a gasket?\u003c\/strong\u003e No, the screw itself does not include a gasket, but it is designed to use Sierra Gasket 18-4698, which should be installed with it to create a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2371 replace?\u003c\/strong\u003e The 18-2371 drain screw replaces OEM numbers 688-45341-00-00 and 688-45341-10-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2371 drain screw weigh?\u003c\/strong\u003e Each unit is listed at 0.01 pounds, reflecting the small size of an individual drain screw.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this screw be used for both drain and fill ports?\u003c\/strong\u003e Yes, the Sierra 18-2371 is used as a drain and fill screw on lower unit and gearcase housings that use the M8-1.25 thread and match the listed OEM numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a new gasket required every time the drain screw is removed?\u003c\/strong\u003e It is recommended to replace the gasket, such as Sierra 18-4698, whenever the 18-2371 drain screw is removed to maintain a leak-free seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2371 an OEM or aftermarket part?\u003c\/strong\u003e The 18-2371 is a Sierra-brand replacement part manufactured as an equivalent to OEM numbers 688-45341-00-00 and 688-45341-10-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering this item?\u003c\/strong\u003e Ordering the Sierra 18-2371 provides 50 individual drain screws; the matching gasket, Sierra 18-4698, is a separate part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy drain screws in a pack of 50?\u003c\/strong\u003e A pack of 50 Sierra 18-2371 screws is intended for shops and technicians who regularly service lower units and need a ready supply of correctly sized drain and fill screws.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105965787,"sku":"SIE-18-2371","price":9.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2371__28318.1558324186.500.750.jpg?v=1785329156","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2371-lower-unit-drain-screw-for-yamaha-outboards-replaces-688-45341-m8-1-25-thread","provider":"Good Vibes Marina","version":"1.0","type":"link"}