New 20 lb Aluminum CO2 Cylinder with CGA320 Valve, Handle, and Free Leak Stopper Aluminum Carbon Dioxide Cylinder with CGA 320 valve installed and carry handle/valve protector. 20 Pound (LB) capacity, Shipped empty. 1800 PSI, DOT-3AL and TC-3ALM designed, high strength aluminum alloy 6061-T6.