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When the bathroom toilet is flushed, a gurgle and small amount of water will come from the kitchen sink (p trap perhaps). The kitchen sink has a new under the counter mechanical vent. I suspect...

The toilet is on the first floor. The drain line from the kitchen (the line starts at the kitchen, goes approx 20 feet, and there the line from the bathroom connects) looks to be relatively new 4"...

I recently purchased a house (35 yr old) in which the kitchen sink vent was removed (it was completely clogged). The plummer installed a mechanical vent for the sink drain. That works fine for the...