AAV Location or placement under Kitchen sink?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Timothy Miller, Oct 11, 2021.

  1. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

    Joined:
    Feb 3, 2021
    Location:
    NC
    InkedPXL_20211011_012137370_LI.jpg [​IMG]

    In this situation, is the current location of the P Trap in relation to the AAV valve correct, or must the P-trap be below the base of the drain pipe?

    miller-wrong-way-sink-01.jpg
     
    Last edited by a moderator: Oct 11, 2021
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    P-trap U must be below the drain pipes. What you have is incorrect.

    You may have to cut out clearance, for the bottom of the U, in your cabinet bottom. Alternatively, you could raise the horizontal pvc pipe before the AAV.

    In the attached sketch, you put a sanitary tee (santee) up higher, using a long-sweep bend or two 45s to drop the drainage. Then the trap arm goes into the trap adapter on the side of the sanitary tee. AAV is 4 inches above the sanitary tee.
     

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    Last edited: Oct 11, 2021
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  4. Terry

    Terry Administrator Staff Member

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    You could also install a long turn 90 and go vertical to a santee with the AAV above that.

    [​IMG]
     
  5. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

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    Location:
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    Thanks for the words of wisdom. I Plan to do just that. Thanks!
     
  6. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

    Joined:
    Feb 3, 2021
    Location:
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    thanks for the advice! much appreciated
     
  7. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

    Joined:
    Feb 3, 2021
    Location:
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    would this updated diagram be correct, from what I have learned thus far? InkedPXL_20211011_012137370_LI.jpg
     
  8. Reach4

    Reach4 Well-Known Member

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    That works nicely. Many prefer to avoid the baffle center-tees and use the tee as Terry pictured. I presume the center tees may be more likely to clog.
     
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  9. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

    Joined:
    Feb 3, 2021
    Location:
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    Thanks for the input!
     
  10. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

    Joined:
    Feb 3, 2021
    Location:
    NC
    PXL_20211014_034825518.jpg
     
  11. Timothy Miller

    Timothy Miller Drip under Pressure =Expert

    Joined:
    Feb 3, 2021
    Location:
    NC
    sani-tee on it's back is a no-no, but I put the cleanout in there if it ever clogs, -(didn't want to cut it out and put a wye in).
     
  12. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
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    I had not noticed that. If that ever becomes a problem, you have plenty of pipe to put in a combo (wye+45) instead of the santee.

    But you are going to have easy cleaning if a clog every would happen.

    You might drop that slip joint tee into the trap a tad to give 2% slope on the slip joint horizontals. I don't see slope in the photo, but maybe it's there already.
     
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