3/4" temperature & pressure relief valve, with long shank thermostat, for water heaters up to 2" thick tank & 105,000 btu, provides fully automatic temperature & pressure relief protection for hot water storage tanks & heaters with 2" thick walls & 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, wetted surface of this product contacted by consumable water contains less than 1/4 of 1 percent, 0.25%, of lead by weight, asme rated, csa listed.