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 brass body construction with 3/4 inch NPT threaded male inlet and 3/4 inch NPT threaded female (drain) outlet, and stainless steel spring. It is listed and certified by CSA. The pressure relief is set at 100 psi (6.9 bar).