5 lb. Aluminum 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: MaterialAluminum Capacity5 lbs. Max. Pressure1800 psi Diameter5-1/4" Height17-1/2" Weight (Empty)7-1/2 Lbs. Valve ThreadsCGA-320 (Intended for use with a CO2 Regulator)