This Roughneck gas diffuser is made of brass. It features 360 degree wrench rotatable, aluminum-jacketed gooseneck. Plus, it is compatible with Roughneck C-Series, C-3010, C-3012, C-3015, C-4010, C-4012, C-4015, C-5010, C-5012, C-5015, Miller brand and is for use with ROUGHNECK guns. It can be used for flux-cored welding (FCAW), MIG welding.