Easy standpipe

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Ian Gills, Nov 16, 2007.

  1. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Messages:
    2,777
    Location:
    USA
    In my basement I have an old cast iron sink that is properly drained and vented to cast iron pipe.

    I will be replacing this rusty old sink with a new utility sink. No problems there.

    Currently, my washing machine drains into the sink, and one possibility is to continue draining it into the new sink.

    But I am thinking about possible ways to make the set-up look neater.

    I would like to install a standpipe. I understand that I would need to vent this. I have seen Terry's diagram about how I could do this and vent it. However, I do not really want to do it this way, given that I have iron pipe. Rather than go to that trouble I would opt to continue draining into the sink.

    But I have also just read about Air Admittance Valves.

    So here is my question.

    If I plumbed in a stand pipe, with a p-trap and an AAV and then joined this to before the P-trap on the utility sink (which is normally vented) would this be OK?
    Last edited: Nov 16, 2007
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,015
    Location:
    New England
    It may not work...AAV's allow air in, not out (unless they're broken). A washing machine pushes a lot of water out, creating a big air pressure wave. A normal vent would allow that to equalize, an AAV wouldn't. Just my 2-cents...
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