Converts 7-Way Round blade connector to 5-Flat connector. Easily adapts tow vehicle connector to trailer connector. Simply plug adapter into tow vehicle connector and plug in trailer connector. Full length plug shell ensures positive latching.Maxiseal harness adapters feature full-length plugs to guarantee positive latching and a secure connection. A non-corrosive, nylon shell battles corrosion. Compatible with virtually all trailer lighting systems.