Catalina 10 lb. Co2 Tank Keg Beer Aluminum Carbon Dioxide Cylinder with CGA 320 valve installed. 10 LB (Pound) capacity, Shipped empty. 1800 PSI, DOT-3AL and TC-3ALM designed, high strength aluminum alloy 6061-T6. 6.89 inch diameter, 21.4 inch length, 1.125" UNF inlet thread.