... 100% Tested 3.Good after-sell service 4.Certification:2008 Check Valve,One way Valve,female check Valve1.Material:Stainless steel 304 or 3162. ... )8.OEM orders are welcomePneumatic Check valve, One way, KA Series, Port size 1/8", 1/4", 3/8", 1/2", ... 3/4", 1", 1-1/4", 1-1/2", 2". Specification ... Time0.03sLife(Ten Thousand)>=150 Pneumatic One Way Check Valve KA-15