anyone ever seen 2 vent pipes under sink?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by cidgrad98, Sep 16, 2005.

  1. cidgrad98

    cidgrad98 New Member

    Messages:
    8
    I'm finishing out a new house and finishing out plumbing myself. The plumber who roughed it in has retired and I'm not sure what is going on under 2 of my sinks. I have my hold cold supply as normal then 2 PVC drain pipes coming out of drywall :confused: ? I'm used to seeing only 1 :) Not sure which one to cement my p-trap to...was this meant for some type of studor vent. If so how do I hook it up...P-trap on left and studor vent on right? I hate to open up the drywall to investigate but it looks like I may have to.

    Thanks
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,251
    Location:
    Cave Creek, Arizona
    vent

    without knowing what is in the walls, and without being able to look into the openings, it is impossible to say what the idea was. If they are side by side, however it is not likely to be for a Studor vent which would normally be above the drain opening.
  3. plumguy

    plumguy New Member

    Messages:
    192
    Location:
    MA
    I'm a little suprised that you're plumber retired in the middle of a job! I would imagine he/she could answer you're question over a simple phone call...if not how about the local plumbing inspector that inspected the work.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    Is it just possible that you have two drain lines for a double sink? It is fairly common to run one line, but two isn't a bad idea either, especially if one has a disposer. My unprofessional opinion.
  5. toolaholic

    toolaholic General Contractor Carpenter

    Messages:
    874
    Location:
    Marin Co. Ca.
    hay plumguy

    there,s been a few jobs we,ve all retired on haven,t we ?

    we just used different words at the time :D
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,251
    Location:
    Cave Creek, Arizona
    retired

    And a lot of them were directed toward the customer.
  7. Do A Little Experiment

    its either a loop vent or a vent from above that is
    supposed to be tied in during the install under the sink


    the best way to figure out which line to tie in your
    drain to is to simply flush a couple of toilets in the house

    and simply listen to the open pipes under the
    sink for the sound of rushing water....

    it should be loudest from the main drain line side

    and if you are really lucky, as an extra bonus
    you might even get
    an ooooohhh --soooo --pleasent smell --blast back into your face
    while doing this experiment....
    Last edited: Sep 17, 2005
  8. Kristi

    Kristi Tradesman Plumber

    Messages:
    176
    Location:
    Vancouver, BC
    Can you not ask this retired plumber what the plan was? If you're on speaking terms, ask him to refresh his memory and let you know... ;)
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