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Answer by Walker for Can a plumbing vent go up and then back down to the...

In the UK, in some cases, you can use an “air admittance valves” for a toilet, rather than a vent pipe provided you have a stack between it and the public system. The ideal is that when you flush, a...

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Answer by Blessed Geek for Can a plumbing vent go up and then back down to...

A vent must not allow accumulation of trapped air/gasses. Bending downwards would probably not be acceptable.

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Answer by Tester101 for Can a plumbing vent go up and then back down to the...

905.2 Grade.All vent and branch vent pipes shallbe so graded and connected as to drainback to the drainage pipe by gravity.(2006 International Plumbing Code).This might prevent you from doing what you...

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Answer by BMitch for Can a plumbing vent go up and then back down to the...

I'm guessing it would be against code, but I've never looked this up, so maybe some others will chime in. For all practical purposes, you don't want a space where anything (moisture) can collect and...

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Can a plumbing vent go up and then back down to the connection with the vent...

I am changing the location of all the fixtures in my bathroom. This move will put the toilet and sink on the opposite wall from the stack. I was originally planning on running a vent up the wall with...

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