20 lb CO2 Tank New Aluminum CGA320 with SIPHON TUBE 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. 8.0 inch diameter, 28.2 inch length, 1.125" UNF inlet thread.