There is an extra hole in the side of this that looks like a hose mounting hole, but it's in the wrong spot and it's not recessed, which means that if you accidentally mount it with this hole, you will NOT be able to get this thing back off the hose without something small to press into the mounting snap. There is also the actual proper mounting hole on the side, which is recessed and works as intended.Why they thought to have a second hole, I have no idea. There has to be a good reason, right? It's just frustrating, because you could accidentally snap the little snap into it. Also, the head of this thing rotates 360 degrees but is at a slight angle, which is actually kind of annoying. It exacerbates the "extra hole" problem, since you don't, at a glance, know which way to install it. You have to take an extra few seconds considering how to mount it each time, and to definitely avoid mounting in the wrong hole.Other than that, it works pretty well. It works a lot better than the one with the built-in storage on the 400 series. That one has some airflow problems, causing dead zones. This one seems a lot better thought out.