This 1/2" 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, 1/2" NPT threaded male inlet and 1/2" NPT threaded female (drain) outlet connections with Teflon tape applied to threads, test lever and stainless steel spring. It is ANSI Z21.22 approved, listed and certified by CSA. The pressure relief is set at 150 psi (10.3 bar).