The Portable CO2 Cylinder Kit add-on accessory from Hobart Welders, makes small MIG welders even more portable because the kit replaces the need for a bulky gas cylinder. The kit contains a patented fixed-flow regulator, a gas hose, an empty 20 oz. paintball cylinder, mounting brackets with hardware, spare o-rings and installation instructions. Compatible with many popular MIG welders, the kit is sold separately, or bundled with Hobart's Handler 140.