{"product_id":"drain-screw-gasket-fits-mercury-mercruiser-johnson-evinrude-lower-unit-replaces-12-19183","title":"Drain Screw Gasket – Fits Mercury\/MerCruiser\/Johnson\/Evinrude Lower Unit (Replaces 12-19183)","description":"\u003csection\u003e\n\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis high-quality aftermarket \u003cstrong\u003eDrain Screw Gasket – Fits Mercury\/MerCruiser\/Johnson\/Evinrude Lower Unit (Replaces 12-19183)\u003c\/strong\u003e ensures a perfect seal for your marine engine's gearcase. It is designed for all MerCruiser stern drives and most Mercury\/Mariner outboards that use a 3\/8-16 drain or fill screw. It also fits Johnson\/Evinrude outboards with the same 3\/8-16 thread size, providing broad compatibility across popular engine brands.\u003c\/p\u003e\n\u003cp\u003eThis part offers a direct interchange for a wide array of part numbers from brands like Mercury, Johnson\/Evinrude, Sierra, GLM, and Mallory. It is available in two designs: the traditional blue fiber style and a newer yellow, silicone-based rubber coated stainless steel version which does not require crushing to seal.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSeals gearcase drain and fill screw holes to prevent water intrusion and oil leaks.\u003c\/li\u003e\n\u003cli\u003eFits standard 3\/8-16 threaded drain plugs.\u003c\/li\u003e\n\u003cli\u003eAvailable in both traditional blue fiber and modern yellow rubber-coated steel designs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/MerCruiser\u003c\/td\u003e\n        \u003ctd\u003e12-19183Q02, 12-19183K02, 12-191833, 191832, 19183, 19183B, 20260B, 20260\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003e307552, 300434\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-2244, 18-2945, 18-29451-9\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e31170\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-60101, 9-60102\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eSEI Marine\u003c\/td\u003e\n        \u003ctd\u003e98-102-09\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eFor Mercury\/MerCruiser, this gasket fits all stern drives and most outboard gearcases. Note that some newer FourStroke EFI, Verado, and Racing models use the yellow rubber-coated steel variant (OEM 26-830749).\u003c\/p\u003e\n\u003cp\u003eFor Johnson\/Evinrude and Chrysler\/Force\/US Marine, this part fits all outboards equipped with 3\/8-16 drain\/fill screw holes.\u003c\/p\u003e\n\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Mercury\/MerCruiser Engine Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eAll stern drives\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e12-19183, 12-191832, 12-191833, 12-19183B, 12-20260, 12-20260B\u003c\/td\u003e\n        \u003ctd\u003eTraditional blue gasket\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eMost outboards\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e12-19183, 12-191832, 12-191833, 12-20260\u003c\/td\u003e\n        \u003ctd\u003eExcept Japanese origin outboards\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e40-50-60 EFI\u003c\/td\u003e\n        \u003ctd\u003e40-60\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e70-90 EFI\u003c\/td\u003e\n        \u003ctd\u003e70-90\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e115 EFI\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e135-300 Verado\u003c\/td\u003e\n        \u003ctd\u003e135-300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e175-300 Four Stroke V6 \u0026amp; V8\u003c\/td\u003e\n        \u003ctd\u003e175-300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e250-300 4.6L V8 Racing\u003c\/td\u003e\n        \u003ctd\u003e250-300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e450 4.6L V8 Racing\u003c\/td\u003e\n        \u003ctd\u003e450\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e26-830749\u003c\/td\u003e\n        \u003ctd\u003eYellow rubber coated stainless steel (newer design)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Johnson\/Evinrude Engine Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eOutboards\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e307552, 300434\u003c\/td\u003e\n        \u003ctd\u003eFits 3\/8-16 drain\/fill screw holes\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Chrysler\/Force\/US Marine Engine Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eChrysler\/Force\/US Marine\u003c\/td\u003e\n        \u003ctd\u003eOutboards\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eF50556, F8077, F8186\u003c\/td\u003e\n        \u003ctd\u003eFits 3\/8-16 drain\/fill screw holes\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eDrain Screw Gasket\/Seal\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eFits 3\/8-16 drain\/fill screw holes\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eVarious (Blue fiber gasket or Yellow rubber coated stainless steel)\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlue (traditional) or Yellow (newer design)\u003c\/dd\u003e\n  \u003cdt\u003eThread Size\u003c\/dt\u003e\n\u003cdd\u003e3\/8-16\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eNewer yellow design is silicone-based and does not require crushing to form seal\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Drain Screw Gasket (12-19183Q02\/12-19183K02)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003ePosition the engine so the lower unit drain screw is pointing downwards. For outboards, tilt the engine up.\u003c\/li\u003e\n  \u003cli\u003ePlace a suitable oil drain pan under the lower unit.\u003c\/li\u003e\n  \u003cli\u003eUsing a large flathead screwdriver, loosen and remove the lower drain\/fill screw. Be prepared for gear lube to start draining.\u003c\/li\u003e\n  \u003cli\u003eRemove the upper (vent) screw to allow oil to drain completely.\u003c\/li\u003e\n  \u003cli\u003eInspect the magnetic tip of the drain screw for metal shavings, which can indicate gear wear.\u003c\/li\u003e\n  \u003cli\u003eRemove and discard the old drain screw gasket. Clean the screw threads and the seating surface on the gearcase.\u003c\/li\u003e\n  \u003cli\u003ePlace the new gasket onto the drain screw.\u003c\/li\u003e\n  \u003cli\u003eOnce the gear lube has been refilled according to the manufacturer's procedure, reinstall the drain screw with the new gasket. Tighten until snug, but do not overtighten.\u003c\/li\u003e\n  \u003cli\u003eClean any excess oil and monitor the drain screw for leaks after running the engine.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if I need the blue or yellow gasket?\u003c\/summary\u003e\n  \u003cp\u003eBoth the traditional blue fiber gasket and the newer yellow rubber-coated steel gasket fit the same 3\/8-16 drain screw. The yellow design was introduced on some Mercury models from the mid-2000s onwards and offers a more modern seal. For most applications, either style works, but it is best to match the type originally used on your engine if possible.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this gasket fit my Japanese-made Mercury outboard?\u003c\/summary\u003e\n  \u003cp\u003eNo. Most Mercury outboards manufactured by Yamaha or Tohatsu (which are typically smaller horsepower models) use a different, metric drain screw and gasket. This 3\/8-16 gasket is for US-made Mercury\/Mariner models and all MerCruiser stern drives.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes the newer yellow gasket require a different installation torque?\u003c\/summary\u003e\n  \u003cp\u003eThe yellow silicone-based gasket does not require \"crushing\" to form a seal like the traditional blue fiber one. It should be tightened until it is snug and secure. Overtightening can damage the gasket or the gearcase threads. Always follow the torque specs in your service manual if available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace my drain screw gasket?\u003c\/summary\u003e\n  \u003cp\u003eThe drain screw gasket should be replaced every time you change your lower unit gear lube, which is typically recommended annually or every 100 hours of operation, whichever comes first. Reusing old gaskets significantly increases the risk of leaks.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing drain screw gasket?\u003c\/summary\u003e\n  \u003cp\u003eThe most common signs are gear lube weeping or dripping from the drain screw area. Another critical sign is milky, emulsified gear lube when you drain it, which indicates water has entered the lower unit—often due to a failed gasket.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse my old drain screw gasket?\u003c\/summary\u003e\n  \u003cp\u003eNo, it is strongly recommended to use a new gasket every time the drain screw is removed. The old gasket has been compressed and may have imperfections or nicks that prevent it from creating a perfect seal, leading to oil leaks or water intrusion.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717887856955,"sku":"2151","price":12.49,"currency_code":"USD","in_stock":true}],"url":"https:\/\/seasierra.com\/products\/drain-screw-gasket-fits-mercury-mercruiser-johnson-evinrude-lower-unit-replaces-12-19183","provider":"SeaSierra","version":"1.0","type":"link"}