parkworld 1.5 ft. 6/3 3-Wire 50 Amp 125/250-Volt Twist Lock SS2-50P Plug to 50 Amp 6-50R-Outlet Welder Adapter(SS2-50P to 6-50R) 885576 - The Home Depot
L6-20P 3-Pin Male Twist Lock 220/250V Plug To L5-20R 3-Prong Female Twist Lock 110/125V Receptacle Socket Outlet Adapter, Electrical Power Cord Convert, NEMA FX711-2
30 Amp Twist Lock Plug Connector Set - Walmart.com