Holds on well.
Just what I needed for the old mask!
These should always be backed up.
Quite convenient and probably better than that 2-hole model. The only "problem" it is that I do not know either way, it's over, and I've tried the both. There could be an arrow in that spike and two letters "UP" next to it so there was no need to guess that the godfather it might be intended for. When upside down, there is a small chance that the pipe will fall out of the way.