... Pressure: 10k, 16k Type: A, AS, B, BS, C, CS, D, DS, E, ES Air Vent HeadAir Vent Head can be used on ... 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 of ... in ballast bilge. We have many choice of Air vent head, please contact me for more products information