If you can get it apart again, after you clean it take a little mineral oil or coconut oil and smear both the channel and the nubbin just where they fit together. Put them together slightly, and move then together back and forth to distribute the oil. It should work better.This is the new water can I bought that was supposed too be the best. It sticks and you can't refill it. I managed to open it after a week but its now stuck again
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I explained all this and the fact that my coop needs a hanging waterer. I purchased this with the hanging hook and rope, not cheap.
All this came as I became ill and Princess was on antibiotics.
They sent another that will only go on the floor. So it looks as if I will have to find another supplier, which I am sad about because I have been using this supplier for a long time and even bought food for a rescue from them. How disappointing it all is.