Pure Energy CO2 Systems arrive to you, already tested, and ready to use in competition right when your receive it. However, you do need to have them filled when you receive them. These tanks are equipped with the Repeater Pin Valve which is the moset reliable pin in the industry. The Repeater Pin Valve has a recessed valve that will connect easily and is constructed out of brass fittings for increased durability. Pure Energy CO2 Systems has a safety purge valve installed from the factory to the highest industry standards. /// Sizes: 12oz, 20oz, 24oz