Nilight 7 Way Trailer Plug Y Pigtail Splitter Double Brasse 7 Pin Female to Dual Male Trailer Plug Round Blade Connector for Connecting Slide in Truck Camper and Trailer Y Splitter, 2 Years Warranty in high quality. It is used for towing a double trailer combination. This 7 Way Female to Dual 7 Way Male plug is commonly used at half-ton.