The MIG Gas Conversion Kit makes it easier to weld light gauge metal and produces a cleaner weld. The gas has a cooling effect on the weld deposited metal to reduce burn through. The MIG Gas Conversion Kit also permits the use of the less expensive solid MIG wire and produces a weld that can be easily painted over. This Kit includes the gas shut-off solenoid, hardware, gas lines, contact tips, nozzle, hose liner, regulator & CO2 adapter. NOT FOR WELD PAK 125.