The Reliance T and P (Temperature and Pressure Relief) Valve is designed to protect water heaters from overheating and over-pressurization. It is a component that is integral to the safe operation of the water heater. Features a bronze body with 3/4" NPT male inlet and 3/4" NPT female outlet connections, unique thermostat with special thermo-bonded coating, and a test lever.• 3/4" Male NPT Inlet x Female NPT outlet with 2-1/2" long shank• Designed to protect water heaters from overheating & over pressurization• Fits directly into water heater• Temperature relief 210 degrees fahrenheit and 99 degrees celsius• Factory setting pressure 150 PSI test lever standard• CSA & ASME listed, certified ANSI Z21.22.