Quote:
Originally Posted by steve s
In my experience, which I may have mistakenly assumed to be universal, sometimes the sink still won't drain even with the stopper in the open position.
Steve
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Steve,
This is a prime example of surface tension, however, in this example the root cause of the trapped air bubble is usually a non-operational vent pipe. If the drain is properly vented the vents can sometimes accumulate leaves in the pipe and cease to work properly.