Miller® True Blue 227749 MIG Gun Consumable, Standard Gas Diffuser, Style: Spoolgun, 9/32 / 5/16 Inch Outer Diameter Collar, Brass, Amperage: 30 amp, Series: Spoolgun, For Type/Brand/Model: Heavy-Duty FasTip™ Contact Tips, Spoolmatic® 30A And XR™-Pistol Guns