Series 3L Pressure Relief Valves are used in residential applications to protect against excessive pressure on domestic storage tanks, tankless water heaters, and solar heating applications. It consists of a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, stainless steel spring, and test lever. Model 3L-Z9 has a stainless steel lever and pin for outside solar applications. ANSI Z21.22 approved, ASME rate, and design certified and listed by CSA. Can be used with WATTS® Series 210 gas shutoff valve. Pressure Range: 75 to 150psi (5.27 to 10.34 bar), Standard Pressure Settings: 75, 100, 125, and 150psi (5.17, 6.90, 8.61, and 10.34 bar).