TowSmart 12 in., 4-Way Flat Trailer Wiring Connector 1441 - The Home Depot
Trailer connectors in North America - Wikipedia
Amazon.com: ONLINE LED STORE 12ft 7-Pin Trailer Plug Cord Wire Cable [7-Way Trailer Wiring Harness] [Brake & Light Control] [10-14AWG] 7 Prong Trailer Light Wiring Connector for RV : Automotive
Trailer Wiring Adapter: 7 Way Euro Round To Flat 4 Conversion Plug
Dr Infrared Heater 6 ft. 7-Way Trailer Plug Cord Wiring Harness, Heavy-Duty Weatherproof, Corrosion Resistant Inline Cable, for RV, Campers DR-RV106 - The Home Depot