Air Vent Head Size: 50A-500A Pressure: 10k, 16k Type: A, AS, B, BS, C, CS, D, DS, E, ES Air Vent HeadAir Vent Head can be used on water tank and oil tank.Size: 50A-500APressure: 10k, 16kType: A, AS, B, BS, C, CS, D, DS, E, ES, FBody Material: Cast iron, ductile ironMesh Material: SS304, SSStandard: JIS-KS91A-121, CB/T3594-94, DIN, ISONote:Oil Tank Air Vent head has character of cover on top of ...