Permatex's Water Pump Thermostat Housing, .05 oz., is a noncorrosive, sensor safe RTV silicone gasket material formulated specifically for water pumps and thermostat housings. Commonly found in the automotive aisle, this Water Pump & Thermostat gasket maker is the highest water glycol resistance available in an RTV silicone. Highest water glycol resistance available in an RTV Silicone. Resists aging, weathering and thermal cycling without hardening, shrinking or cracking. Forms a tough, flexible, silicone rubber gasket. Sensor safe, non corrosive. Non-flammable and non toxic. Top Job Applications: Water Pump, Thermostat Housing.