Cayman. Engine Coolant Thermostat Gasket. Engine Coolant Thermostat Housing O-Ring. Part cannot be reused/reinstalled. Engine Coolant Thermostat Gasket. Engine Coolant Thermostat Housing O - Ring. Housing seal. Thermostat hsng gasket. Included with: Thermostat housing, Water thermostat housing Part cannot be reused/reinstalled.