Fastway Trailer Products introduces the tethered 7-Way Trailer Plug Cover. This cover is the fast and easy way to keep dirt, bugs and corrosion out of the 7-pin wiring harness. Unlike standard plug covers that may get lost, this simple plug cover conveniently stays tethered to the 7-Way Plug while towing. The 7-Way Trailer Plug Cover is right there ready to use when it’s time to store the trailer. “This handy product reduces the maintenance costs associated with replacing a 7-Way Trailer Plug,”.