deltabravo wrote:
I tried this and it wrecked my 7 pin plug, on two trailers
:R
Video is 4 minutes too long to show the issue.
The "failure" isn't from the cover.
The "failure" came from the fact that the plug was left dangling upside down with that cover on. In a nutshell "user error".
Here is a snap shot of the video as to why the user used it incorrectly..

Anyone with any smarts would realize that a "cover" or cap like this will allow water to seep past the sides and fill up the cap, it can't provide a 100% water tight seal. Even if it did provide a water tight seal, it would only be good for 100% molded plugs (not all trailers are equipped with molded plugs).
A "cap" on anything sits at the highest point to allow water, liquids, moisture to roll (shed off) down the sides.
Think of it like putting a hat on your head to shed the rain..
That device to be properly used needs the plug to be stored in a UPRIGHT position (the opposite direction of what is in the snapshot above), not left dangling to the ground.