Check the listing for details. Tweco 54A Gas Diffuser 15401100, Pack of (5). Condition: New. Listed at 23.65 USD. Tweco 52FN Brass Fixed Nozzle Gas Diffuser is perfect for use with slip-on nozzle assemblies with 450 A Tweco No. 3/4 MIG gun series as well as eliminator front-end consumables. Gas diffuser has magnificent electrical properties making it ideal for use in light to medium duty standard welding application up to 450 A. It features part number rolled stamped on the external surface and overall length for easy identification. Gas diffuser is made from 360-brass alloy bar stock offers consistent dimensional stability. It features machined threads on the external surface to let the nozzle assemblies to thread over and accommodate the nozzle in place during the welding process. Gas diffuser features a conduit set screw that can accommodate the conduit liner in place. Package of 5