This electrical adapter is designed to adapt a 7-way RV blade vehicle socket to fit a 4-way flat trailer plug. It features quality plastic construction, requires no splicing and comes with an LED connector tester dust cover. Not only does this dust cover protect the socket from dirt, water and road grime, but it also allows you to test your vehicle-side wiring connector to ensure your electrical systems are functioning properly. All CURT wiring and electrical products come with a one-year limited warranty to give you the assurance you need to tow with confidence. | Curt Electrical Adapter With Tester (7-Way Rv Blade Vehicle To 4-Way Flat Trailer)