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Series 5300A By-Pass Control Relief Valves are used in commercial, residential and industrial applications to regulate liquid pressure as supplied by a positive pressure pump. It is a poppet-type compact valve that protects equipment by opening at the desired setting to allow excess volume to be by-passed back to the source. Series 5300A consists of a bronze body construction with NPT threaded male inlet and NPT threaded female outlet, Teflon disc, spring and adjustment handle, and a tee handle. Pressure Range: 0 to 250psi (0 to 17.23 bar).