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plumbing - When does an under the sink P-Trap assembly need venting? - Home Improvement Stack Exchange
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Sewer smell coming from under my bathroom sink. Is it normal for the vent to be right there? : r/askaplumber
Why do some kitchen sinks need a vent? My sink does not have one, and we haven't had any problems with the sink, garbage disposal, or dishwasher. - Quora
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2 Air Admittance Valves on double sink, IPC 2009 | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
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