Easily adapt OEM 7-way blade connectors to either 5-flat or a 4-flat connectors Instantly checks electrical circuit for connectivity Displays connectivity using high visibility LEDs Attached dust cover included to keep terminals clean when not towing a trailer Reese 78118 7-Way Flat Pin To 4 and 5-Way Flat Adapter with LED Circuit Tester and Dust Cover SKU: 304.6004 UPC: 42899781189