10 lb. Aluminum CO2 Cylinder, New. 22" tall with valve. 6.9" in Diameter. CO2 Cylinders are shipped empty. Check your phone book under Fire Extinguishers, Fire and Safety Equipment or Welding Gas & Equipment for local companies where you will be able to refill the CO2 cylinder. The average cost for filling 10 Lb CO2 cylinder is $15. This cost will vary with each market area.