Air Safety Valve, 1/4 In Inlet, 50 psi, Rated CFM @ Set Pressure: 53, Control Devices, Mfr#: ST25-1A050$6.95+
Air Safety Valve, 1/2 In Inlet, 200 psi, Valve Type: Hard Seat, Control Devices, Mfr#: SN50-1A200$16.49+