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 bronze body construction with 3/4 inch NPT threaded male inlet and 1/2 inch NPT threaded female (drain) outlet, and stainless steel spring. It is listed and certified by CSA. The pressure relief is set at 75 PSI (5.2 BAR).