I believe this is official, though. The thing in the bottom says "Guest: Itou Hachi", which makes me think this was made for one of the Killing Me! volumes.
In my experience, those little towel bars are flimsy as hell. Eli's gonna accidentally snap the bar out of the socket and bean Nozo with it when she has an orgasm.
Fortunately, the bars are usually chromed plastic, so it won't do too much damage.