Miller® AccuLock™ S Large Thread-On Nozzle, 5/8" Orifice, Flush Tip, Copper (Miller blister pack, 1 per pkg) - For use with MDX-250 MIG Guns and Bernard BTB MIG Guns. Pair with AccuLock S Contact Tips, D-MA250 Diffuser, AccuLock MDX Liners, Power Pin Caps.