Toyota Genuine Accessories PT791-89040 7-Pin to 4-Pin Adapter Designed to work specifically with the Toyota wiring harness. Converts vehicles round 7-pin connector to a flat 4-pin flat connector for towing smaller loads. Allows a standard four-way flat-wired trailer to be connected without the need to rewire trailer or purchase additional harnesses. Provides owner with higher level of towing flexibility, while protecting vehicles circuits. Easy for owner to install and use.