2.5 lb. Steel CO2 Cylinder, Empty How many kegs of draft beer can be dispensed out of a CO2 tank? Where can I get a CO2 cylinder filled? Specifications: MaterialSteel Capacity2-1/2 lbs. Diameter3-1/2" Height18-1/4" Weight (Empty)6-1/2 lbs. Valve ThreadsCGA-320 (Intended for use with a CO2 Regulator) Notes: Round bottom, will not stand upright without support.