{"product_id":"sierra-42489-drain-fill-plug-washer-5-pk-47-42489","title":"Sierra Drain\/Fill Plug Washer for OMC Sterndrive \u0026 Cobra – 42489 – Pack of 5","description":"\u003cp\u003eA proper seal at the gear lube drain and fill ports is essential for protecting your lower unit. This Sierra sealing washer is designed to crush slightly when the drain or fill plug is torqued down, creating a leak-free metal-to-metal seal that prevents gear lube from weeping past the plug threads.\u003c\/p\u003e\n\n\u003cp\u003eSold in a \u003cstrong\u003epack of 5\u003c\/strong\u003e — enough for multiple service intervals or to keep a supply on hand for the season. Replaces OEM part number \u003cstrong\u003e311598\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOMC Sterndrive\u003c\/li\u003e\n\u003cli\u003eOMC Cobra\u003c\/li\u003e\n\u003cli\u003eJohnson outboards\u003c\/li\u003e\n\u003cli\u003eEvinrude outboards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReplaces OEM part 311598 — direct-fit replacement\u003c\/li\u003e\n\u003cli\u003eDesigned for use with drain screw 18-2387\u003c\/li\u003e\n\u003cli\u003eCrush-style sealing washer for a reliable, leak-free fit\u003c\/li\u003e\n\u003cli\u003ePack of 5 — ideal for stocking up across a season\u003c\/li\u003e\n\u003cli\u003eSierra marine-grade quality for freshwater and saltwater use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBest Use Cases\u003c\/h2\u003e\n\u003cp\u003eReplace this washer every time you change the gear lube in your lower unit — reusing a previously crushed washer is the most common cause of gear lube leaks at the drain plug. This pack is well suited for boat owners who service their own engines, as well as marine technicians servicing multiple OMC-powered vessels in a season.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible \u0026amp; Related Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-533\"\u003eMercury 4-Stroke Outboard Oil Drain Screw Washer – 12-803516\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/north-shor-11\"\u003eYamaha Drain Plug Gasket – 90430-08003-00\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThis is a high-turnover consumable — it should be replaced at every gear lube change, not just when it looks worn. A crushed or deformed washer will not re-seal reliably, and a slow gear lube leak in a lower unit can go unnoticed until significant damage is done. The 5-pack format makes it easy to keep a few on hand without overstocking. If you’re servicing an OMC Cobra or Sterndrive, confirm the drain screw part number (18-2387) is also in good condition before reassembly. OEM cross-reference: 311598. SKU: 47-42489.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51089419075620,"sku":"47-42489","price":13.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-424819.jpg?v=1784391962","url":"https:\/\/marisolmarine.com\/products\/sierra-42489-drain-fill-plug-washer-5-pk-47-42489","provider":"Marisol Marine Company","version":"1.0","type":"link"}