This adapter is designed to convert a 7-way connector with round terminals to a standard 4-way flat connector. It is the fastest and easiest way to make electrical connections when pulling a trailer that has a different wiring configuration than the vehicle. The rugged construction will offer years of trouble-free service and the compact design allows for convenient storage when not in being used to pull a trailer. Instant plug in installation. Non-corrosive thermoplastic construction. Features non-corroding brass contacts. Compatible with plastic or metal connectors.