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The drain is connected to a vent that allows water to drain without making a gurgling sound, and the P-trap is not remaining filled. The P-trap is designed to hold water under the sink and create a "vapor barrier" that will keep the septic smells (and sounds) out of your bathroom. Generally what happens is that the P-trap is not deep enough and gets drained during normal operation and/or is being blown out by the pressure from the house vent. Extend the existing "P" trap so that is holds more water. It should have a deeper bowl. == Answer== make sure you run water in it one time every two weeks. And make sure you have a p- trap.

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โˆ™ 2007-02-14 19:14:50
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Q: Why would air be flowing out of an upstairs bathroom sink drain making a loud wind tunnel sound?
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