Adding AAV ?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by lennyk, Jun 9, 2014.

  1. lennyk

    lennyk New Member

    Messages:
    11
    Location:
    Port-of-Spain
    Hello,

    I have a situation with no venting, shower and sink connected to same waste line.

    The shower drains slowly due to no venting and air lock caused by sink trap.

    Would adding a Studor AAV(green) in location on drawing help ?

    Thanks,

    L

    dia.jpg
  2. Reach4

    Reach4 Active Member

    Messages:
    2,386
    Location:
    IL
    huge3.png How about this? There would be a minimum and maximum on drain pipe 1.
    There is probably some minimum on drain pipe 2.
    You want a sanitary tee, I think at 3.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,118
    Location:
    Bothell, Washington
    There should also be a p-trap on the shower.

    The AAV goes above the trap arm, not below. The trap arm is the horizontal portion downhill of the p-trap.
    Adding the AAV as shown in the second picture should also vent the shower p-trap.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,811
    Location:
    Cave Creek, Arizona
    if the system is "air bound" an AAV will be completely useless to cure it. AND, if it is air bound, you have a more serious problem somewhere which is causing it to be air bound.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    15,118
    Location:
    Bothell, Washington
    hj's point, is that even with systems that can use an AAV, there needs to be at least on vent through the roof that allows the system to breathe.
    There will be positive and negative air pressure, and the vent allows that. An AAV only allows intake.
  6. lennyk

    lennyk New Member

    Messages:
    11
    Location:
    Port-of-Spain
    As suspected, the line was clogged further down, snaked and all is well now.

    Aav was still put in there is a kitchen drain further down the line and no vent until after there.
    Line is also under sized at 1.5" which i am unable to do anything about.
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