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    mikeizz's Avatar
    mikeizz Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 29, 2007, 06:41 PM
    AAV vs In-Line Valves
    I just wanted to ask a quick question to anyone willing to reply.

    We are living in a house that had a dyi reno done in which the kitchen sink was not vented. When it is drained it would actually squirt water out of the bathroom sink. I have since plumbed in an in- line vent (mechanical spring style) which doesn't open when the drain is pulled.

    I have read these mechanical vents are not allowed but I still seem to find them for about $9 Canadian at the home depot. Is the answer an Air admittance valve instead? What is the difference (other than $30 dollars in price) between the two.

    Also when I leave the mechanical valve off the six inch pipe stub water comes out of the "vent" hole. Will this be a problem for an aav if I put one on in the future.

    I hope you can help

    Thanks Mike
    kitch428's Avatar
    kitch428 Posts: 1,440, Reputation: 152
    Ultra Member
    		  
    #2

    May 29, 2007, 07:24 PM
    I recommend only the Studor AAV. Master plumbers will always frown on these because they're mecanical. Vent stacks are the best way to go, but in a pinch where it's needed, I rec the aav. Don't go cheap on this type of vent.
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
    Ultra Member
    		  
    #3

    Jun 2, 2007, 09:38 PM
    Sounds like you may have a clogged drain. Is the fall [pitch downward] good?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Jun 3, 2007, 10:53 AM
    You can thank Doug for this explanation. The inline vent is the cheap black plastic ones used in mobile homes. It is a simple spring check valve with a rubber disk. It costs about 5 bucks. The studor and oatey which costs about 25 bucks is kind of mechanical in that it has a little ball that blocks the port and is approved by the building code.
    Thanks Doug, Tom
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