Fits Umarex Steel Storm Eliminates need for disposable CO2 cartridges Go back to using disposable CO2 cartridges anytime No alterations are required! Easy to use, easy to attach Includes hose with bulk-fill CO2 tank connector, which connects to the gun's CO2 inlet Bulk-fill CO2 tank NOT included No more small powerlets. This adapter accepts any paintball bottle (click here for 12 oz or 20 oz). Approx. 1300 shots with a 20-oz. tank & approx. 780 shots with a 12-oz. tank. With this setup, you'll spend more time shooting and less time and money on 12-gram CO2 cartridges! Plug & play...absolutely no alterations are made to your Steel Storm!