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Loop Vents

Asked Mar 4, 2007, 09:34 PM — 1 Answer
Does anyone have a trick for telling which rough-in stub is the loop vent and which is the waste line? I found plumbing under my kitchen island and would like to add a bar sink. Typically a loop vent connects back to the waste line after the vent to roof lateral.

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doug238 Posts: 1,556, Reputation: 353
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Mar 4, 2007, 09:39 PM
It was at one time the way a combination waste and vent was done. A 2" simply stubbed up twice and connected at the top. Either one can be used. They go to the same place.
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