The patented Endurance Multi-Tow Connector made by Hopkins Towing Solutions allows for quick installation through a 4 flat and quick splicing to give you a 7 blade, which connects to larger utility trailers with electric brakes. Towing more than one trailer? Take advantage of your existing 4 Flat when adapting. The Multi-Tow 4 Flat to 7 RV Blade and 4 Flat Wiring Kit attaches to an existing 4 flat to bring the lighting functions to the 7 Blade and 4 flat connectors, leaving electric brakes, auxiliary power, reverse lights and ground as the only functions that need to be wired. The Multi-Tow design feature adds multiple towing options from one connector by providing sockets for towing both 7 Blade and 4 Flat trailers. By incorporating exclusive Endurance design features including oversized hinges, internal grommets for enhanced weatherproofing, and a lid that opens 180 degrees that prevents breakage..