Spin-Loc Hi-Flo air tank Connects to .177 and .20-caliber* AirForce Condor rifles without having to remove the tank from the gun Built-in manometer (air pressure gauge) Uses standard quick-disconnect fittings Can be used only with compressed air or dry nitrogen gas Does not fit older models of guns unless they have been retrofitted** to accept the new tank The Spin-Loc air tank makes it much easier for you to refill your tank since you won't have to remove it from your gun. Plus, switching to commonly used quick-disconnect fittings simplifies the whole process. The onboard pressure gauge lets you monitor how much air is left in the tank. No more guessing! *The Condor's Hi-Flo tank is caliber-specific. **To retrofit your gun to accept the Spin-Loc standard tank, send it to AirForce Airguns.