An extra Argon tank is only necessary for non-manufacturers or those wishing to take measurements away from the manufacturing area. 21″ tall and 7″ diameter UN1006 ARGON, COMPRESSED 2.2 ARGON UHP GR 5.0 SIZE 35 DGA 580. Most manufacturing customers will not need an extra argon tank. They can use the supply of argon that they use to fill their IG units.