Thermostat housing sleeve 806992 is for use in MerCruiser 3.0L, 5.0L, 5.7L, 6.2L, 7.4L and 8.2L sterndrive and inboard engines made by General Motors having standard cooling systems. The sleeve supports the thermostat in the thermostat housing. The sleeve is made with polybutylene terephthalate (PBT), a thermoplastic polymer, to withstand the temperatures in the engine and deliver long service life. The Quicksilver brand has been the marine industry leader in delivering premium engine lubricants, accessories and original equipment replacement parts for more than 65 years. It applies the same quality standards as a supplier of lubricants and replacement parts for many original equipment brands in the powersports industries. Quicksilver has earned a loyal following by providing the highest quality products, validated through some of the most rigorous environments and testing procedures. No aftermarket company comes close to matching the level of research and design that goes into Quicksilver products. Buying Quicksilver is buying performance, protection and peace of mind.