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I've moved into a new home and have a lot of little chores to handle up on. One of them is a 'bubbling' or 'popping' noise coming from an upstairs bathroom sink that occurs periodically when one of the A/C units is running.

My theory is that since the main drain line going into the wall is essentially level with where the condensate line taps into the drain that the water level in the Ptrap is inconsistent and sometimes results in bubbling of some sort. I'm not a plumber or engineer.

However, my thought is that if I'm able to shorten the length of the metal drain pipe coming out of the sink, then I'll be able to push that intake adapter piece up a bit so that it is maybe 1" higher (it's as high up as I can get it currently) and therefore above the main drain line and the gurgling will stop.

Update: Included a pic of the hvac drain line out. Two units share this same main drain line and both have a similar series of 90deg bends at the hvac unit.

Thoughts? Advice? enter image description here

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Kevin Hagen
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Take out the Y that the drain line attaches to. (red X) Replace it with a straight tailpiece extender.

Put the Y in the horizontal line into the drain hub. (Yellow mark) You will need to get a longer hose.

Make sure the horizontal line has a tilt toward the wall. Then the condensation will run into the drain pipe and not into the P-trap. Noise is eliminated.

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RMDman
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