... Valve ,the valve body is brass;operating pressure:0-1MPaspecification of Series PU220:PU220-04A:1/2"internal threadPU220-06A:/4 ... Pilot operated safety valve,operating pressure:0.5-1.5MPa,specification of Series PU225:PU225-04A:1/2"internal threadPU225-06A:3 ... Pilot operated safety valve,operating pressure:0.5-1.5MPa,specification of Series SPU225:SPU225-04A:1/2"internal threadSPU225-06A:3 ...