FASTWAY 82-00-3315 7-PIN PLUG COVER
 
The fastest, easiest, and cheapest way to keep corrosion, water and dirt out of your 7-pin wiring harness.
The 7-pin plug cover helps eliminate the frustration and expensive maintenance costs from having to replace a 7-way trailer plug, and the handy tether keeps the cover attached to your trailer, so it doesn't get lost.