Maasdam MPT202 Trailer Wiring Adapter with 7 Way Blade to 4 Way Flat for Vehicle and Trailer End Converts 7-way vehicle connectors with blade terminals to a standard 4-way connector No need for multiple sizes of trailer connectors hanging off the back of your vehicle Brass terminal connectors for better conductivity Made of lightweight and durable plastic Easy to use, just plug in the adapter and start hauling your trailer.