This 3/4 inch pressure relief valve is used in residential applications to protect against excessive pressure on domestic storage tanks and tankless water heaters. It consists of a lead free body construction with 3/4 inch NPT threaded male inlet and 1/2 inch NPT threaded female (drain) outlet, test lever, and stainless steel spring. It is ASME rated. The pressure relief is set at 150 psi (10.3 bar).