Buyers products 4-way die-cast metal trailer connector – trailer side – tc2004 buyers products 4-way die-cast zinc trailer connector is a round terminal slot, trailer-side connector. It attaches to an existing trailer wiring lead, and is commonly used to make a power connection between the vehicle and a utility trailer. It features durable, die-cast zinc construction. features provides a secure electrical connection between your vehicle and trailer. durable die-cast zinc construction. spring style cable guard helps protect your wiring. built-in safety latch assures a secure connection.