Backwater Valve question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Dante1, Mar 26, 2019.

  1. Dante1

    Dante1 New Member

    Joined:
    Mar 26, 2019
    Location:
    Montreal
    hello everyone,
    I’m adding a bathroom in the basement and had a question. I’m adding a shower, toilet and vanity. I managed to find the main drain line which is in line with the stack. I am wondering if I should install the back water valve then the “T-Y” to bathroom or should I install the “T-Y” and then the back water valve to the bathroom?

    Thanks
     
  2. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    Why would you want to use a "check" valve to impede flow ?
     
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  4. Dante1

    Dante1 New Member

    Joined:
    Mar 26, 2019
    Location:
    Montreal
    You install a backwater valve to prevent sewer back flow.
     
  5. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    Then you KNOW it is after the house trap or LAST connection and ONLY if there really is a need for one and it better be accessible and a sign posted so some poor drain cleaner does not get their cable stuck
     
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