Pneuflex SPC 04-G02 is 4mm tubing, BSPP, G 1/4 male connector stainless steel pneumatic air fittings with O-ring thread seal, one of common push in fittings used in corrosive environment such as water treatment plants, food and beverage industry, chemical process equipment, available used with PU tubing, nylon tubing, Teflon tubing...