Retaining Head, Compatible with Brand Tough Gun, Series TOUGH LOCK (TM), Gas Diffuser Number 404-18, Compatible with Series TOUGH LOCK, Connection Type Slip-On, Duty Rating Standard Duty, Welding Processes MIG Welding (GMAW), Connection Thread Type Slip-On, For Use With Bernard BTB MIG Guns, Clean Air Fume Extraction MIG Guns and Tregaskiss Robotic MIG Guns, Material Brass, Maximum Wire Diameter 0.125 in, Minimum Wire Diameter 0.023 in. This item has been restricted from sale in the following state (s): []