Tried again today (different set of gear, though same brand, since I rent)
I cannot do it. Today, I actually could not even undo it on the surface with my tank off and the hose depressurized. The other times I've been able to do that.
The darn thing is just HARD, and my fingers are weak.
Maybe it's something that happens to the nipple on the power inflator over time? If so, the rental kits you're using might have the same problem mine did. Now that I've replaced the power inflator, mine is as easy to operate as the other posters made it sound. I just pull lightly on the end of the hose and it pops right off. It is easy enough that I would say finger strength is not a factor now.
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