Pollak 7-Round RV To 4-Flat Trailer Wiring Connector Adapter 12-716EV 19-1021

It allows conversion of 7 way round RV to a 4 way flat connector. Allows one vehicle to tow either campers or boat trailers without electrical brakes. It connects ground, LT, RT & stop circuits. Full-length plug shell assures positive latching with socket. Sold in 4 color retail visi/pak.