6-30P 3-Pin Male 220/250V Plug To 6-50R 220/250V 3-Prong Receptacle Outlet Miller Lincoln Hobart Plasma Cutter Welder Mig Tig Arc Adapter, Electrical Power Connector Cord Converter NEMA FX502W - Amazon.com
Power Converter 110/125V To 220/250V Electric Adapter 5-15P Wall Plug To 6-50R Miller Lincoln Hobart Plasma Cutter Welder Mig Tig Arc Receptacle Outlet Box NEMA FX581W - Amazon.com
Miller Feature - Multi-Voltage Plug (MVP) - YouTube
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Miller MVP Plug 6-50P for sale (219258) - Welding Supplies from IOC