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  1. Thanks, Terry. The link was helpful and I forgot...

    Thanks, Terry. The link was helpful and I forgot about backup issues.

    I still have a question though. If the vent branches are at 45 degrees and are allowed to drain and the main vent is above the...
  2. Why does the vent have to be above the flood level rim?

    I understand that vents are needed to prevent vacuums from forming because of negative air pressure and thus prevent the traps from draining. I don't understand why the vent needs to be six inches...
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    Thanks Tom, I had no idea drum traps were ever...

    Thanks Tom, I had no idea drum traps were ever required anywhere. If drum traps are siphon proof, why don't we see more of them?

    With a siphon proof trap, you wouldn't need any vent until the...
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    Are Drum Traps less prone to siphoning?

    I recently bought a 1930s fixer-upper and it has have a Drum Trap under the kitchen sink that serves the sink/disposal and the dishwasher. There is no dry vent and the stack connection is about 15...
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    Thanks! I can definitely replace the tee in the...

    Thanks! I can definitely replace the tee in the top picture with a wye and 1/8th turn. I just wanted to make sure that was okay with AAVs since I'd only seen them in pictures with vertical tees.
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    AAV Venting questing, tee direction

    I looked at some diagrams of AAVs and they were all show with the tee back vertical. Does it matter if it is horizontal? I made a sketch of the two options I have. The top is what I would like to do....
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