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Thread: Possible sink vent?

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  1. #1
    DIY Junior Member Randmness's Avatar
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    Default Possible sink vent?

    Hello,
    We are in the process of replacing our kitchen cabinets and sink in our condo unit, and came across the long PVC pipe that runs horizontally below the countertop and connect with the sink drain. In order to fit in the new sink, we need to lower this a few inches. I was a little apprehensive about touching this pipe, as I thought it might contain drainage from the unit above me. After looking around on this forum and others (I'm not a plumber by any means and I apologize if this is the incorrect forum), it looks like this may be the vent (about 40" from the sink) for the kitchen sink. Am I correct?

    Thanks.
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    Last edited by Randmness; 08-24-2012 at 09:17 AM.

  2. #2
    DIY Junior Member hagakure's Avatar
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    It's most likely a vent. I don't think a condo complex would have plumbers stupid enough to run a drain pipe from the floor above directly into the sink drain of the kitchen below. They would be draining into the same drain stack. I don't see how it could have passed inspection if that wasn't the case.

    Hopefully...

  3. #3
    In the Trades Gary Swart's Avatar
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    I do find it interesting that the dishwasher has its own P trap rather than the normal connection. As a DIY I can't comment on its legality, it looks like it should be OK, just strange. Usually the DW drains into the disposal or a special tail piece. What you have seems to me to waste a lot of under sink space.
    Last edited by Gary Swart; 08-24-2012 at 12:22 PM.

  4. #4
    DIY Junior Member Randmness's Avatar
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    Thanks for the comments. Knowing that its a vent definitely makes me less apprehensive about slightly adjusting its location.

    In regards to the DW trap, I will have to look up the local code for MD (Columbia), to see what it says regarding air traps. I would love to get rid of that trap and connect it straight to the disposal.

  5. #5
    Plumber jimbo's Avatar
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    Assuming it is a vent, it probably functions OK, it sort of meets the "spirit" of the code, but definitely does not actually comply with code. A vent cannot be horizontal ( less than 45 angle) when it less than 6" ABOVE the top of the sink. Keep this in mind if you want to change it.

  6. #6
    DIY Junior Member Randmness's Avatar
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    Awesome. When you refer to the vent not being less than 6" above the top of sink, do you mean 'less than 6" from the top of the sink'? The vent is a few inches (about 3 or so) below the counter top.

    I also had a few quick questions:
    1. When lowering the vent, is it recommended to slope the pipe down to the drain vs two 90 degree bends? I imagine the sloping (leveraging two 45 degree adapters) is better than 90 degree turns.
    2. Is it ok to run the pvc pipe behind the metal water supply pipes? However, the wall behind the sink is a cylinder-block wall (maybe 2in deep) so I wouldn't be able to completely hide the PVC in the wall. I will double-check the clearance when I get home.

    Thanks again.
    Last edited by Randmness; 08-24-2012 at 02:25 PM.

  7. #7
    Plumber Winslow's Avatar
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    the horizontal PVC pipe is the vent for the kitchen sink, you can lower as necessary but you should try ond keep the offset above the drainboard (bottom) of the sink. As far as the dishwasher connection is concerned it is most likely illegal because you have 2 traps on 1 trap arm.That's illegal according to the UPC, not sure which code your jurisdiction uses.

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