Used in heavy duty welding application up to 450 amperes. Nozzle housing is cut and Formed from 122 DHP copper alloy tubing. Nozzle insert is machined from a solid brass allow and is crimped in place to allow the nozzle to slide over a metal spring which is part of the gas diffuser. Nozzle insulator is made from G7 silicone material, providing the electrical insulation needed from the gas diffuser. Part No. rolled stamped on the outside surface for easy identification. 3-piece design does not require an additional insulator.