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Discuss Downstairs Toilet bubbles up whenever upstairs washroom flushes. Why? in the General Off-Topic Chat area at PlumbersForums.net

N

Novice Frank

Whenever someone flushes the toilet upstairs, the downstairs toilet bubbles up, like an air bubble escapes, at times, explodes so minor splashes up.
Any reason why this is happening? An air pocket in the pipes, or a minor blockage in the air pipe?
 
Need an aav on the upstairs toilet waste
 

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