Sierra's 18-3653 Thermostat Kit is designed for use in marine applications. The kit contains (1) 18-2858 Thermostat Housing Gasket, (1) 18-2947 Thermostat Gasket, (1) 18-3554 Thermostat, (1) 18-7170 O-Ring, (1) 18-0929 Thermostat Gasket, and (1) 18-0398 Thermostat Gasket. It is interchangeable with GLM 13430 and Mallory 9-43156. Each Sierra product meets or exceeds the original equipment part it replaces.