Sierra 18-2430-9 Gasket Drain Screw (Pkg Of 5) Used with: 3/8-16 drain/fill screw found on all MerCruiser and most Mercury/Mariner O/B gearcases; Rubber coated, stainless steel washer; Forms a tear resistant gearcase drain screw seal; Package of 5; Interchangeable With: Mallory; 9-60105; MerCruiser Stern Drive; 26-830749; Mercury Marine; 26-830749; 26-8M0204693;