Proper fitting for an AAV

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by James23912, Apr 6, 2021.

  1. James23912

    James23912 Member

    Joined:
    May 16, 2020
    Location:
    Vermont
    About to install kitchen sink using an AAV, I have a leftover tee fitting, wondering if I can use that flat or need a wye and turn or whatever it is called, also is there a minimum height for the AAV to be above the horizontal drain, thanks again
     
  2. Tuttles Revenge

    Tuttles Revenge In the Trades

    Joined:
    Oct 15, 2014
    I would use a tee on its back under a sink.. Its only allowing air in.. because it prevents liquid from entering that vertical section, I can't see it needing to be a drainage fitting. In the UPC code, the pipe after the AAV needs to be 2" ... I always install my AAV in the wall in a recessed box made for the purpose. The AAV needs to be a minimum of 4" above the trap arm.
     
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  4. James23912

    James23912 Member

    Joined:
    May 16, 2020
    Location:
    Vermont
    Hi, thanks, I will proceed , appreciate your help
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    VT appears to use IPC.

    However 2 inch drain pipe for a kitchen appears wise. The common place for a clog beneath a kitchen sink is where the drain transitions from vertical to horizontal. Having a way to snake that area is good.
     
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