Permatex 22071 Water Pump and Thermostat RTV Silicone Gasket, 0.5 oz. Sensor-safe, noncorrosive RTV silicone gasket material formulated specifically for water pumps and thermostat housings Highest water-glycol resistance available in an RTV silicone Superior adhesion and flexibility; can be used as a gasket maker or dressing Temperature Range: -65F to 500F (-54C to 260C) intermittent Suggested Applications: Water pump and thermostat housings