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Old 09-09-2013, 02:38 PM   #1
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Air behind Water


I've heard this expression used numerous times, and have been told it refers to proper venting through the stack, but, haven't actually had ANYONE who could actually explain what it meant?

All input welcomed!

Michael

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Old 09-09-2013, 07:15 PM   #2
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Air behind Water


Basically, if your DWV system is not vented properly with air behind sewage/water, traps will be sucked out and sewer gas will enter the house. It has to get air behind the water some way for everything to drain properly. The library will have many books on this subject as well, depending on how deep an explanation you want. This quick link might explain it a little better. Thanks.

understanding plumbing vents

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Last edited by jmon; 09-09-2013 at 07:42 PM.
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Old 09-09-2013, 10:01 PM   #3
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Air behind Water


want to see it ....take a straw put it into a glass of liquid put your finger over straw and lift it out of the liquid ..then take your finger off the straw...wa la ....ben sr
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