30 Amp 250 Volt Male Female Twist Lock 3 Wire Plug Nema L6-30P/30R Superior Electric YGA017-KIT 30 Amp 250 Volt Male Female Twist Lock 3 Wire Plug Nema L6-30P/30R. Twist Lock Electrical Plug and Receptacle Kit 3 Wire, 30 Amps, 250V, NEMA L6-30P / L6-30R YGA017 KIT. Replace worn or broken PLUGS / RECEPTACLES to bring new life to power tools, machines & extension cords. Replacing takes just couple of minutes with easy-to-use galvanized steel internal posts with screws. 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.