Easy standpipe

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

  1. Ian Gills

    Ian Gills Senior Robin Hood Guy

    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

    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...
Similar Threads: Easy standpipe
Forum Title Date
Plumbing Forum, Professional & DIY Advice PEX: Is it that easy? Jun 30, 2013
Plumbing Forum, Professional & DIY Advice Good quality 3 valve faucet (tub) thats easy to repair? Nov 6, 2012
Plumbing Forum, Professional & DIY Advice An easy question. Jun 26, 2012
Plumbing Forum, Professional & DIY Advice Totally Horizontal T in venting - not as easy as it look. May 14, 2012
Plumbing Forum, Professional & DIY Advice Easy, I think: Can a regular elbow trainsition from a vertical to horizontal drain? Feb 13, 2012

Share This Page