Protect residential water heating systems from excess pressure with the Watts 3/4 in. Lead Free Copper Poppet Type Pressure Relief Valve set to relieve at 150 PSI. Designed for potable water applications on domestic storage tanks and tankless water heaters, this valve features a durable lead-free copper alloy body with an NPT threaded male inlet and NPT threaded female drain outlet, plus a convenient test lever for manual operation. Built with a stainless steel spring and rated for up to 210°F, it is ANSI Z21.22 approved and ASME rated, with CSA design certification and listing for dependable residential performance.