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  1. #1
    Join Date
    Jan 2014
    Posts
    3

    Default Dishwasher Drain Plumbing

    I an remodeling a kitchen and installing an under-mount sink. The sink is deeper and being under-mounted, the drain connection is now lower. I do not have a dishwasher, so the current dishwasher connection is a dishwasher drain fitting between the sink drain and the p-trap, in that vertical pipe run. With the new deeper sink, this fitting (about 3-4" long) will have to be removed. I may be able to install it under the side sink (which is not quite as deep), or in the horizontal drain coming from it. My concern is that the water may back up in the other sink. The only other option may be to tear out the wall and try to lower the drain connection for my p-trap. Can you give me some guidance here?

    Thanks,
    Dan

  2. #2
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,208

    Default Re: Dishwasher Drain Plumbing

    If it's a double sink you can put the dishwasher tee in the line between the two sinks but it must be before the trap.
    John

  3. #3
    Join Date
    Jan 2014
    Posts
    3

    Default Re: Dishwasher Drain Plumbing

    Quote Originally Posted by johnjh2o View Post
    If it's a double sink you can put the dishwasher tee in the line between the two sinks but it must be before the trap.
    John,

    Thanks for the reply. I was hoping that I could put the dishwasher tee in between the two sinks like you state. This pipe does shoot straight into the tee connection where up is out into the main sink, and down is to the p-trap. This is not a y-type connection. Do I need a different connection there to prevent water from coming up to the sink?

    I got in a hurry in my first post and said I didn't have a dishwasher, but meant disposal.

    Thanks,
    Dan

  4. #4
    Join Date
    Jan 2008
    Posts
    1,977

    Default Re: Dishwasher Drain Plumbing

    Probably not if the drain works as well as it should. The DW drain pump doesn't have a lot of flow or pressure involved so I think you'll be fine. IIRC, they also make a fitting with a built-in directional diverter to aim the flow away toward the drain side, but these also introduce a restriction for the sink drains so use them only when you have to.

    Phil

  5. #5
    Join Date
    Jan 2014
    Posts
    3

    Default Re: Dishwasher Drain Plumbing

    Quote Originally Posted by Mastercarpentry View Post
    Probably not if the drain works as well as it should. The DW drain pump doesn't have a lot of flow or pressure involved so I think you'll be fine. IIRC, they also make a fitting with a built-in directional diverter to aim the flow away toward the drain side, but these also introduce a restriction for the sink drains so use them only when you have to.

    Phil
    Thanks guys. I think this part of my job will be a lot easier than I thought it might have been.

    Dan

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