Multi Trailer Plug: This dual output trailer wiring adapter is equipped with a standard 7-way RV blade socket while retaining the existing 4-way flat wiring, can establish connection between non-matching trailer plug and vehicle socket for signal light display Wide Application: This 4 pin flat to 7 pin RV blade and 4 pin flat trailer adapter makes it easy to tow most trailers, semitrailers, caravans, recreational vehicle Good Quality: The trailer adapter plug is made of ABS plastic to protect the adapter from rust Protective Covers: The 7-way and 4-way female trailer wiring adapter connectors come with rubber dust cover and spring-loaded cover to protect against water and dust Easy to Install: The trailer adapter is easy to install, package includes mounting brackets, screws and nuts