Wet Alarm Valve & System, Alarm Valve, valves Main parts: water motor gong, pressure switch, gauge,regarding charmber,short pipe,etc,ball valves,etc.Size:4",5",6",8"Rated working pressure: 175psiHydraulic test: 175psiEffective discharge range: more than 6 metersAirtight testing pressure: 3.2Mpa