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Thread: DIY dishwasher install to double sink

  1. #1
    DIY Junior Member renomama's Avatar
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    Default DIY dishwasher install to double sink


    My friend says this will work, is he right? I'm afraid I'm going to have backup. If it's not right what will work better?

    Thank you
    Last edited by renomama; 07-10-2010 at 11:32 AM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    That is wrong, wrong, wrong.
    Cut the tailpiece on the left and have the p-trap grade downhill to the sink drain.

    The first ruile of plumbing, is that water needs to go downhill.

    Last edited by Terry; 07-10-2010 at 01:08 PM.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Are those soap bubbles on the rubber connector, too? It isn't sealed well. As plumbed, the drain line (trap arm) will fill up with food particles and crud, and block up. It has to flow downhill from the output of the trap.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Actually, there is no good way to connect whichever side gets the dishwasher. I would use two "P" traps on that installation, but the "branch tee" is still going to make that one hard to connect properly.

  5. #5
    TROJAN WORLDWIDE SALES RP MACPLUMB 777's Avatar
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    basically you need to cut the wall open and lower the san tee in the wall ! !

    Drainage water " does " not run uphill you have to get that lower in the wall that is

    all there is to it !

    Once you do that the rest of the sink plumbing will come together the right way ! !

    MACPLUMB 777

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  6. #6
    Plumber jimbo's Avatar
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    There are three inviolable cardinal rules of plumbing.

    1st rule: things flow downhill. You have created worse than a deep trap, which is a problem in itself. You have a serious crud catcher.

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