15 Pound CO2 Aluminum Cylinder Tank New - Sherwood CGA 320 Valve, Soda System Home Brew Making (Carry Handle) Aluminum Carbon Dioxide Cylinder with CGA 320 valve installed and carry handle/valve protector 15 LB capacity, 1800 PSI, DOT-3AL & TC-3ALM designed high strength aluminum alloy 6061-T6; Cylinder with valve, shipped empty 6.89 inch diameter, 28.1 inch length, 1.125" UNF inlet thread.