Buyers Products 2-Way Die-Cast Zinc Trailer Connector is a round terminal pin, truck-side connector. It attaches to your vehicle and is commonly used to make a power connection between the vehicle and a trailer mounted winch or electric tarp. It features a durable, die-cast zinc construction with a spring-loaded door to protect the terminals when not in use. Round terminal pins are configured in a horizontal or vertical pattern. Is a round terminal pin, truck-side connector. Trailer Electrical Connection Provides a secure electrical connection between your vehicle and trailer. Durable die-cast zinc construction. Built-in safety latch assures a secure connection. Spring-loaded door protects terminals when not in use. Available in either horizontal or vertical terminal pin configurations. Suitable for 4-6 gauge wire.