Mercury - Quicksilver Sea Water Pump Housing For V6 & V8 MerCruiser Sterndrive Engines 807151A12. Overview. Saltwater can be brutal on metal parts, but the Mercury Marine 807151A12 Quicksilver Sea Water Pump Housing is built to fight back. Designed for V6 and V8 MerCruiser sterndrive engines made by General Motors (454 and 502 CID), this housing is molded from corrosion-resistant plastic - the perfect material for longevity in marine conditions. It's built for engines equipped with a V-belt pull