Pressure Relief Valve Aluminum Cover with 1½“ BSP/NPT Female Threaded drain portWhen network pressure exceeds set point, valve opens by itself quickly and protects system by releasing over pressurePressure Relief setting : 1.5 kg/cm2 to 5.5 kg/cm2 Other Products Semi-Automatic Disc Filter Ring Takeoff 32 MM ELBOW Inline Dripper Pressure Relief Valve Foot Batten Assembly 32 MM END CAP 32 MM MTA Pump Connecting Nipple Tee