Engine Coolant Thermostat Gasket. Engine Coolant Thermostat Housing Seal. Engine Coolant Thermostat O-Ring. Engine Coolant Thermostat Seal. Thermostat Housing Gasket. Vendor:FUJI SEIKO. Vendor:NIPPON. Cover. Housing. O - Ring. rubber. unit. Water Neck. Included with: Thermostat, Thermostat assembly, Thermostat Cover, Thermostat Housing, Thermostat unit.