Mercury - Quicksilver Sea Water Pump Housing For V6 & V8 MerCruiser Engines with Serpentine Belt System 807151A9. Overview. Saltwater takes no prisoners, especially when it comes to metal pump housings. The Mercury Marine 807151A9 Quicksilver Sea Water Pump Housing is designed to solve that problem with a corrosion-proof, marine-grade plastic body that keeps your cooling system running smooth. Built for V6 and V8 MerCruiser sterndrive engines made by General Motors, this replacement housing fits