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Sierra 18-2430 Drain Screw Gasket. Sierra's 18-2430 Drain Screw Gasket forms a tear resistant gearcase drain screw seal. Rubber coated, stainless steel washer. Used with 3/8-16 drain/fill screw found on all Mercruiser and most Mercury/Mariner O/B gearcases. Interchangeable with: Mallory: 9-60105. Mercruiser Stern Drive: 26-830749. Mercury Marine: 26-830749