Plumbing Question
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    buckteeth445's Avatar
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    Plumbing Question

    Anyone wanna take a stab at why there is a closed loop above this S trap? I've never seen anything like it but I'm planning to replace this vanity soon.

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    IndianaJim's Avatar
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    My guess would be that someone thought it would work like a vent without actually venting.

    It could also be for a planned expansion. Maybe a double sink? Doesnt make sense to do that, since PVC is pretty easy to work with.
    Either way, whoever did it was most likely (hopefully) not a licensed plumber...
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    buckteeth445's Avatar
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    Quote Originally Posted by IndianaJim View Post
    My guess would be that someone thought it would work like a vent without actually venting.

    It could also be for a planned expansion. Maybe a double sink? Doesnt make sense to do that, since PVC is pretty easy to work with.
    Either way, whoever did it was most likely (hopefully) not a licensed plumber...
    Agreed, it looks like someone could have easily glued a vent cap on the 1-1/2" tee and called it good if that were the issue. I'll probably just cut the loop out.

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    The only place we've used them is a kitchen island where there is no possibility of a stack option. Local code doesn't allow a mechanical vent so we use these but never in a vanity. If your plumbing wasn't vented properly, a plumber could have added this to remedy a drain issue.I would elect to keep the loop if that's the case as opposed to a mechanical vent. Check your local plumbing codes. You could run into issues if and when you decide to sell.
    Last edited by Fozsey; 05-13-2018 at 01:05 PM.
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    Ray_PA's Avatar
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    I cannot wrap my head around how putting loop of PVC will vent anything.
    Here is how a loop vent is made.

    https://www.youtube.com/watch?v=xvKJ2llIpac
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    Fozsey's Avatar
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    Quote Originally Posted by Ray_PA View Post
    I cannot wrap my head around how putting loop of PVC will vent anything.
    Here is how a loop vent is made.

    https://www.youtube.com/watch?v=xvKJ2llIpac
    Exactly! It's easy in new construction. I'm not a plumber but we've done this in the exact way the video describes in kitchen islands and it meets our local code.
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    buckteeth445's Avatar
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    Quote Originally Posted by Fozsey View Post
    Exactly! It's easy in new construction. I'm not a plumber but we've done this in the exact way the video describes in kitchen islands and it meets our local code.
    Just thinking outside of the box here, maybe they didn't have a 1-1/2" cap but they did have plenty of sweeps and extra pipe...

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    Fozsey's Avatar
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    Quote Originally Posted by buckteeth445 View Post
    Just thinking outside of the box here, maybe they didn't have a 1-1/2" cap but they did have plenty of sweeps and extra pipe...

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    I'd check your stack situation. We've seen some homeowners take some desperate measures correcting something as simple as removing a bird nest.
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    buckteeth445's Avatar
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    Quote Originally Posted by Fozsey View Post
    I'd check your stack situation. We've seen some homeowners take some desperate measures correcting something as simple as removing a bird nest.
    I've never had an issue with water draining aside from when my in-laws came over and jammed corn husks and cobbs down the disposal after dinner. Apparently they do not have an issue with that at their home.

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    I agree it's likely a venting alternative. I would rather use a ~$22 Air Admittance Valve (AAV). Home Depot, Lowes, and Ace all carry them.

    If you want more reliable advice, I've always gotten really great responses from pros in both the plumbing and electrical forums on Houzz. Those folks are fantastic.

    https://www.houzz.com/discussions/plumbing
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