Update your semi truck or trailer with safely sealed electrical openings, with the Truck-Lite 4" 16-Gauge GPT Wire Marker Clearance Plug that ensures you're Ready for the Road Ahead™. To adapt LED lamps to conventional plug harness systems while preventing dirt, moisture, or other unwanted contaminants from entering a system, this replacement device gently plugs into the powered space to protect the device. Manufactured with tin-plated brass terminals for improved conductivity. FleetPride is your First Click in Heavy Duty®.