... , oxygen cylinder valve 2, ISO Certificated 3, Tolerance:0.005~0.02mm 4, Capacity:0.5~1020mm 5, Delivery:on time China OEM customized oxygen cylinder valve ... , Copper, Stainless steel, Plastic, Aluminium, POM, Delrin, Titanium Alloy etc.2) Surface treatment:Zinc plating, Anodization, Chemical fim, Powder, Passivation, Sand ...