Air gap vs high line loop dish washer drain . . .

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sjh, Mar 13, 2019.

  1. sjh

    sjh New Member

    Nov 12, 2007
    Will a high line loop work as well as an air gap for my dishwasher? Wife does not care what the State of California wants, she does not want a air gap on the countertop!
  2. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    Yes. In normal operation, it will work as well or better.

    The air gap purpose is to prevent water from going from the drain back into the dishwasher. I don't know what all would have to go wrong for that to happen.

    If it is already installed, maybe this would interest her -- a liquid soap dispenser that is supposed to replace the cap on an airgap:

    There are a also combination air gap +soap dispensers. I don't know how well they work with a dishwasher.
    Last edited: Mar 13, 2019
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    FWIW, an air gap will always prevent contamination from finding its way back into the dishwasher from your sink drain. A high loop will do the same MOST of the time. It depends somewhat on your fault tolerance level once you realize that you could get sick if there was a problem and you have a high loop. Sort of like using your seat belt, but never being in an accident. Do you wear it, or not, and take the chance. Personally, I've been driving decades, and never actually needed the seat belt or air bags, but I'm still glad I have them.

    A commercial location will have an air gap on their dishwasher.
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