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Vent foam


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I was told once that the code change a few yrs back requiring clothes washer standpipe to join directly to a minimum three-inch branch was due to soapmakers' efforts over time to make their product more and more sudsy, because market research told them the sudsier the better in consumer's mind. If the home is older and the 1 1/2 connects with a 2 the suds may be backing up the vent.

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