... Air Vent HeadAir Vent Head can be used on water tank and oil tank.Size: 50A-500APressure: 10k, 16kType: A, AS, B, BS ... : SS304, SSStandard: JIS-KS91A-121, CB/T3594-94, DIN, ISONote:Oil Tank Air Vent head has character of cover on top of ... head.Water Tank Air Vent head has character of permeability on two side ...