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I think the most likely cause is that waste water from the upper sink is being forced up into the vent pipe for the lower sink. The water descends without much restriction for about nine feet and accumulates enough kinetic energy to escape its intended path through the junction of the two drains. Some of it splashes into the lower drain and some into the ...


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The guy who plumbed this probably goes out for beer with the guy who plumbed our double-wide. :) I learned the hard way, by repairing previous work here, that you can't have too many vents. Where to put them though? Your drop from the tub to the P doesn't have a lot of space. I can also appreciate not running horizontal below the "flood level." So, I'd ...



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