Quickly convert your vehicle side connector to a trailer end connector with this Hopkins Towing Solutions 7-Blade to 4 Flat Adaptor with LED Test Lights. It is constructed with a patented weatherproof design. The integrated LEDs indicate when wiring is functioning properly. This trailer light adapter includes a dust cover to help protect terminals and prevent corrosion. It provides a simple plug-in equipped with an easy pull grip for quick and easy disengagement. This convenient Hopkins adapter eliminates having to rewire a vehicle or trailer.