5 Pin To 7 Pin Adapter | etrailer Hopkins Multi-Tow Trailer Connector Adapter - 7-Way to 5-Wire Flat/4-Wire Flat and 12-V Power Socket. Adapt the 7 -way trailer socket on your vehicle to work with a 4-way or 5 -way flat connector on the trailer. Adapter also provides a 12-volt power source outlet. Great for tailgating. 7 pin to 5 pin trailer adapter | eBay www›Search›7 pin to 5 pin trailer adapterSave 7 pin to 5 pin trailer adapter to get e-mail alerts and updates on your eBay Feed. + Items in search results. See search results that fit your vehicle. Select Vehicle. Tell us about your vehicle to find the right parts faster + RV Round 7 pin to Flat 5 pin Boat Trailer Light Connector Converter Adapter Plug.