Bargman 54-98-052 Adapter (7-Way Round Pin to 4-Way Flat Vehicle/Trailer) 7-way round pin to 4-flat step down adapter Plugs into 7-way round pin vehicle connector on one end - other end connects to 4-flat trailer end connector Allows a quick switch from one style connector to another when towing multiple trailers Molded from high quality materials; ergonomic design is easy to plug and unplug Backed by Bargman's Limited 1 Year Warranty