@Summerhill38, thanks for your input. There is not room to go around the drain, I would have to actually lift the walker over it...a bit hard with two buggered up shoulders. I wonder where that would leave a visually impaired person who also uses a walker? No amount of spray paint or even notices before this drain would be of much help to them. The cover needs to be of a grid design so there are cross bars preventing wheels getting jammed. This is, after all a hospital, where, conceivably, this situation might arise, that is, a person both physically as well as visually challenged. This is a designated walkway, not some uneven ground between here and there.