Mercury - Quicksilver Thermostat Housing Gasket Cooling System Seal Cork 47510. Overview. If you're pulling apart the thermostat housing on an older MerCruiser, this is the gasket you'll want on hand. The Mercury Marine 47510 Quicksilver Thermostat Housing Gasket fits MCM and MIE GM-based V6 and V8 engines that use the older two-piece housing design. Made from quality cork, it compresses nicely to create a solid, leak-free seal between the housing plates. It's simple, tough, and built for the ki