pole junction box, the 7 - Pole Junction Box provides a fast, simplified way of connecting wires from the trailer cord to the trailer wiring. It is an excellent area for trouble shooting by offering a single connection point. The junction box is made of heavy plastic and includes hardware, 4 closed and 4 open rubber fitted grommets making it weather proof and corrosion resistant. It can also be used as a 6 pole box as it comes with extra grommets for 6 conductor cable. External mounting flanges on 7-inch centers. Rating Cable Cord Length Configuration