Ag&Au, I've been concerned about the water fill on our coach too. There are several companies that make a surface mount locking hatch that should fit over the water fill. I looked at a few doors a while back but don't remember where I saw them. I did measure and the doors will fit over the water fill. Figure when I get time I will order one, paint it black like the water fill and install. Shouldn't have to cut anything, just drill holes for mounting, put on some caulk and good to go. If I get around to doing this soon I will post where I got the door from.
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