The Beverage Factory offers only brand new aluminum Co2 Tanks. We do not sell reconditioned steel tanks. Every Co2 cylinder is produced from high strength aluminum alloy 6061-T6. These tanks are popular because they are not as heavy as steel tanks and do not rust. The service pressure is up to 1800 PSI/124 BAR with a test pressure of 3000 PSI/207 BAR. These cylinders are stamped with required U.S. Department of Transportation a Markings. The 320 Valves are CGA approved, and have a male thread for Co2 Regulators.