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    RockyMtnHigh's Avatar
    RockyMtnHigh Posts: 3, Reputation: 1
    New Member
     
    #1

    Jan 5, 2009, 02:11 AM
    Placement of AAV
    Long story short our kitchen sink in our house needs an AAV as a result of a renovation. My question is to the exact location of the AAV downstream from the p-trap. Thank you in advance for any advice.

    RMH

    Option 1. Place it ontop of the "T"

    AAV
    L
    l--------------------P-Trap
    l
    l
    l

    Or...

    Option 2. Downstream of Ptrap but before elbow

    AAV
    L
    ------------l---------P-Trap
    l
    l
    L
    L
    massplumber2008's Avatar
    massplumber2008 Posts: 12,807, Reputation: 1210
    Senior Plumbing Expert
     
    #2

    Jan 5, 2009, 05:10 AM
    Hi RMH:

    The AAV should be located within a few feet of the p-trap. It can be piped on the horizontal at least 6-12" above the pipe (picture 1 on left), or it can be on top of the vertical pipe above the ptrap (picture 2 on right). The AAV must remain accessible in case it needs to be changed in the future.

    Let me know if need more...

    MARK
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    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #3

    Jan 5, 2009, 08:57 AM
    Quote Originally Posted by RockyMtnHigh View Post
    Long story short our kitchen sink in our house needs an AAV as a result of a renovation. My question is to the exact location of the AAV downstream from the p-trap. Thankyou in advance for any advice.

    RMH

    Option 1. Place it ontop of the "T"

    AAV
    l
    l--------------------P-Trap
    l
    l
    l

    or....

    Option 2. Downstream of Ptrap but before elbow

    AAV
    l
    ------------l---------P-Trap
    l
    l
    l
    l
    How's this grab you? (see image) Good luck, Tom
    dclynch's Avatar
    dclynch Posts: 202, Reputation: 19
    Full Member
     
    #4

    Jan 5, 2009, 12:04 PM
    Are AAVs allowed in Mass residential codes?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,807, Reputation: 1210
    Senior Plumbing Expert
     
    #5

    Jan 5, 2009, 04:05 PM
    Hi Dennis...


    NO... AAVs are NOT allowed in Massachusetts residentially or commercially.

    You can appeal to the local plumbing inspector for a variance, but I have only seen 1 approved in 26 years!

    Let us know if need more here...

    MARK

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