Trailer cable is used in many applications but is most often used to connect trailers to trucks or other heavy equipment. Trailer cable supplies power to the brakes and taillights, making it integral to the safety system of the trailer. Therefore, it can be extremely dangerous if the trailer cable is not working properly and must be protected against possible damage. Trailer cable is meant for extended outdoor use, so in order to keep a secure connection, it must be able to withstand a multitude of outdoor elements, such as heat, cold, weather, grease, and oil.