3/4" temperature & pressure relief valve, with 8" thermostat, for water heaters up to 105,000 btu, provides fully automatic temperature & pressure relief protection for hot water storage tanks & heaters up to 105,000 btu/hour, comes with test lever & extension thermostat for installation in the hot water outlet line or directly in the tank tapping, temperature sensing element must be immersed in the water within the top 6" of the tank, 3/4" male inlet & 3/4" female outlet, temperature relief 210 degrees Fahrenheit & 150 psi pressure, asme rated, csa listed.