I had a similar cover put on both my vents on my Jayco flight before I picked it up from dealer when I bought it. sure makes it nice to be able to run vent fan when it is raining and not worry about getting wet inside. Also nice to leave vents open when parked at home, to help keep the heat from being horrid, without worrying about rain. Must not be an issue, because my dealer didn't hesitate to include installation as part of purchase deal.