This is a personal size 30cuft cylinder to refill your high compressed air tank. This 30cuft works best with 5oz 3000psi cylinder for light and transportability. - Made of Proprietary 6061 - T6 Aluminum - Cycle tested 100 000 to service pressure - Durable power coated finish - Highly resistant to exterior corrosion - Standard 3/4 x 14 NPSM inlet thread - Oxygen cleaned - Made in U.S.A Dimension: H: 22 x W: 4.5 x L: 4.5 Weight: 15 pounds The 30cuft tank can refill this cylinder 25-30 times. The 30cuft tank can refill this cylinder 5-10 times. The 30cuft tank can refill this cylinder 3-8 times. You will need this refill adaptor to refill your tanks