Grab an extra Spin-Loc and leave the heavy air tank at home. The onboard pressure gauge keeps you in the know about your Texans fill pressure, so no more guesswork! This tank will only work with the .50 caliber Texan. Spin-Loc Air Tank for .50 AirForce Texan Built-in manometer (air pressure gauge) Uses standard quick-disconnect fittings Can be used only with compressed air or dry nitrogen gas Does not work with other caliber Texans 490cc