1.drain with stable performance, and low air leakage 2.Automatic cold air exhaust mechanism without air lock 3.api ce With GS ... ,ISO5208Type Of OperationGear,Electric,Pneumatic,Manual-Air-HydraulicDN(NPS)1/2"~2"PN(LB)Class 150LB~2500LBMain MaterialsCarbon Steel:WCB,WCC,WC1 ... ,Stainless steel:CF3,CF8,CF3M,CF8M,304,316,314L,316L, 2.Assemble 3.Disc/PLUG2CR13,304,304L,316,316L+STL SEAT2CR13 ...