{"product_id":"drain-fill-plug-washer-for-johnson-evinrude-40-48-50-hp-outboards-replaces-omc-311598-sierra-18-4248-9-pkg-of-5","title":"Sierra Drain\/Fill Plug Washer 18-4248-9, Replaces 311598, Plastic, Pack of 5","description":"\u003cp\u003eThe Sierra 18-4248-9 is a plastic drain\/fill plug washer sold in a package of 5, sized for use with outboard and sterndrive gearcases during routine gear lube service. It seats under the drain and fill plugs to create a reliable seal against gear lube leakage, preventing seepage past the plug threads as the gearcase heats and cools through normal operation. Being plastic rather than metal, the washer resists corrosion in the wet, salt-exposed environment around a lower unit drain plug, and it is inexpensive enough to replace as a matter of routine every time the gear lube is changed, which is the standard practice for sealing washers of this type. This part is designed to be used with the Sierra 18-2387 drain screw, pairing the correct washer to the correct screw for a proper seal at the drain point. Because it directly replaces OEM number 311598, it is a straightforward swap for anyone servicing a gearcase that originally used that factory washer. Being sold in a pack of 5 lets a technician or boat owner keep spares on hand, since a fresh washer at every fluid change is the simplest way to avoid a plug that will not seal.\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 18-4248-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Drain\/Fill Plug Washer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e 18-2387 Drain Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 311598\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eDesigned for use with the Sierra 18-2387 drain screw at the gearcase drain\/fill point.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e311598\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4248-9 washer made of?\u003c\/strong\u003e It is made of plastic, which resists corrosion better than a metal washer in the wet environment around a gearcase drain plug.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many washers come in a package of the 18-4248-9?\u003c\/strong\u003e The 18-4248-9 is sold in a package of 5 plastic drain\/fill plug washers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-4248-9 washer replace?\u003c\/strong\u003e This washer replaces OEM number 311598.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat drain screw is the 18-4248-9 washer used with?\u003c\/strong\u003e It is used with the Sierra 18-2387 drain screw to seal the gearcase drain\/fill point.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-4248-9 washer with a different drain screw?\u003c\/strong\u003e The 18-4248-9 washer is specified for use with the 18-2387 drain screw; that is the pairing it is designed to seal against.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow often should the drain\/fill plug washer be replaced?\u003c\/strong\u003e A fresh washer like the Sierra 18-4248-9 is typically installed every time the gear lube is drained and refilled, since reusing an old sealing washer risks a leak at the plug.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4248-9 an OEM or aftermarket part?\u003c\/strong\u003e The 18-4248-9 is a Sierra-brand replacement washer that cross-references to OEM number 311598, so it is an aftermarket equivalent rather than a factory-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4248-9 washer weigh?\u003c\/strong\u003e The Sierra 18-4248-9 drain\/fill plug washer weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I do not replace the drain plug washer?\u003c\/strong\u003e Reusing a worn washer under the drain or fill plug can allow gear lube to seep out or water to seep in, which is why a new 18-4248-9 washer is recommended at each service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4248-9 washer sold individually or in a set?\u003c\/strong\u003e It is sold as a package of 5 washers, not individually.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988172026075,"sku":"SIE-18-4248-9","price":7.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4248-9__15912.1737887344.500.750.jpg?v=1785329157","url":"https:\/\/www.goodvibesmarina.com\/products\/drain-fill-plug-washer-for-johnson-evinrude-40-48-50-hp-outboards-replaces-omc-311598-sierra-18-4248-9-pkg-of-5","provider":"Good Vibes Marina","version":"1.0","type":"link"}