13 Way to 4 Way Trailer Plug Adapter for RV Connector Converter 1、Trailer Adapter: The adapter allows to convert European style 13 way round to American style 4 way flat, suitable for trailers and RVs. 2、Plug and Play: The adapter minimizes the hassle of installing and wiring, which is plug and play, convenient to use. 3、Reliable Shell: The shell adopts high strength ABS plastic, which is light and wear resistance, with great weather resistance, waterproof, anti rust and oxidation. 4、Great Stability: Heavy duty plastic construction has good stability, which is not easy to be damaged, brass terminals provides excellent electrical conductivity. 5、Secure Connection: The adapter can perfectly compatible with your vehicles, easily snaps into socket and holds firmly without loosing and shaking.