This welding gas hose compatible with argon, argon/CO2 mixture, helium and any other welding gases, suitable for various TIG and MIG welding machines. 6.56 feet long inert gas hose, crimped 5/"8 UNF-18RH gas fittings on both ends, will thread into most tig mig welders, works great with argon CO2 welding gas regulator.