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Unfortunately, I do not know the appropriate terminology but, there is a small hose that fits into a tube within a cylindrical container in the toilet tank. When this occurs, I can see initially hear and, after removing the toilet tank cover see water running from the hose intermittently; this also seems to have an effect on the water level in the toilet bowl.

I can temporarily solve the issue by removing the tank cover and inserting the small hose back into the tube. This works well for a while but, then the problem seems to reoccur. I live in a rental which most recently replaced our old-fashioned toilets with smaller “energy efficient” toilets. I cannot help but notice how flimsy the plastic parts are in the toilet tank.

Is there something that I could do to permanently stop the hose from popping out of the tube or is it necessary to call maintenance?

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That tube is supposed to be attached (often with a metal clip) to the overflow tube.

Refill Tube Diagram

It shouldn't just be inserted down into that larger diameter plastic tube (overflow tube), since as you've found, it will pop out again.

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You can fix it with a hose clamp of the right size, tighten it with the attached screw. If it's very small diameter, use a spring clamp instead.

As it's inside the water container, one of stainless steel should be used.

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