Mercury - Gasket for Select FourStroke, Jet and ProKicker Outboards Engine Sealing Component Precision Molded Marine Polymer 8M0214960. Overview. When you've spent enough seasons on the water, you learn just how much your engine relies on the quiet, dependable parts you rarely see. A gasket may seem simple, but when it seals right, the whole motor feels more sure of itself. You hear it in the steady idle, that smooth, confident tone that tells you everything beneath the cowling is working togeth