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This 1/2 in pressure relief valve for wells is used to protect against excessive pressures in well systems. It is not diaphragm actuated, and is used for pressure relief service only. It consists of a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, and stainless steel spring.
WATTS® N30 Series 0109265 Pressure Relief Valve, 1/2 in Nominal, FNPT x MNPT, 5 to 25 psi, Bronze Body