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    Venting sewage ejector w/ a studor vent

    Asked Mar 3, 2007, 11:54 AM 5 Answers
    Hello, my home builder put drain pipes for tub, toilet and lavatory in basement floor; I'de like to know if venting my sewage ejector w/ a studor vent is up to plumbing code and if it will work for a full bath or must I dry vent it to the supplied vent in basement. Also, will venting the lavatory drain still necessary in this case.

    Thanks, Ron

    Last edited by massplumber2008; Oct 29, 2015 at 01:29 PM.
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    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #2

    Mar 3, 2007, 02:44 PM
    Quote Originally Posted by Doc P
    hello, my home builder put drain pipes for tub, toilet and lavatory in basement floor; I'de like to know if venting my sewage ejector w/ a studor vent is up to plumbing code and if it will work for a full bath or must I dry vent it to the supplied vent in basement. Also, will venting the lavatory drain still necessary in this case.

    Thanx, Ron
    UPC calls for direct venting to above roof or at least three feet away and above windows for residential construction. I am not familiar with 'Studor'. Is that a macerator type waste pump system? It would be a closed unit and not have a vent if it macerates.
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    doug238's Avatar
    doug238 Posts: 1,556, Reputation: 62
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    #3

    Mar 3, 2007, 08:38 PM
    A studor vent or an oatey vent is an air admittance valve [ aav ]. A sewage ejector will not work with an aav. It must be vented to a 'breathable' location. It must be able to let incoming water push a head of air and outgoing water draw air behind it.
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    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #4

    Mar 4, 2007, 12:40 AM
    Quote Originally Posted by doug238
    a studor vent or an oatey vent is an air admittance valve [ aav ]. a sewage ejector will not work with an aav. it must be vented to a 'breathable' location. it must be able to let incoming water push a head of air and outgoing water draw air behind it.
    Thanks doug238, You may tell that I am out of touch here, so here is my dumb question concerning this setup. What would be the best way to correct the problem? Also is this an air gap or like a backflow valve? Thanks, nm
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    doug238's Avatar
    doug238 Posts: 1,556, Reputation: 62
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    #5

    Mar 4, 2007, 05:33 AM
    A studor vent or an oatey vent is an air admittance valve [ aav ]. A sewage ejector will not work with an aav. It must be vented to a 'breathable' location. It must be able to let incoming water push a head of air and outgoing water draw air behind it.
    An air admittance valve is a small device that is attached to the vent pipe to terminate the vent in an accessible location without completely piping the vent to the roof. It allows air to be sucked into the system but not pushed back out.
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    speedball1's Avatar
    speedball1 Posts: 29,303, Reputation: 1939
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    #6

    Mar 4, 2007, 08:43 AM


    Bottom line!
    The pit vent is a DEDICATED VENT. This means that it does not connect to the house system. The reason being, (as Doug explained) is that while the house vent system breaths in to relieve vacuum while the pit vent must breath both in and out. A AAV will only allow air the breath in so it's not suitable for the pit vent. Good luck, Tom
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