Superior Electric YGF045F Twist Lock Receptacle Flange 2-Pole 3-Wire 20A 250V NEMA L6-20R.Suitable for indoor and outdoor industrial applications. Super tough nylon body resists damage from severe impact, abrasion and chemicals.Twist lock feature makes for a more reliable connection in industrial and commercial applications where sudden movement and incidental impact can disconnect the non-locking plug.For use with Generator Transfer Switches or Power Inlet Plug to supply power to your Home, Business, Boat or Trailer.