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You may not have a backflow preventer in the main line. This prevents anything coming back from the main line. It may be coming from your neighbors above you on the line.

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โˆ™ 2007-01-05 05:31:37
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Brass vs stainless steel whichis suitable for plumbing

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Q: What is the cause of sewer backup when all vents and drains and sewer lines are clear?
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