Shanghai General Gas Valve QF-2 oxygen cylinder valve,gas cylinder valve material:brass WP:15MPa DN:4mm Shanghai General Gas ValveQF-2 oxygen cylinder valve,gas valve,valve,cylinder valve,oxygen valveMedium Available O2,Air,N2.WP (Mpa):15DN (mm):4Outlet thread (mm):G5/8Inlet thread (mm):GB8335 PZ27.8Safety Device (Mpa):21 ± 1.5material:brass oxygen cylinder valve QF-2