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Thread: double sink shooting water up thru drain when garbage disposal is on

  1. #1
    DIY Junior Member
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    Jan 2011
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    Arizona
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    Default double sink shooting water up thru drain when garbage disposal is on

    Hi, I have a kitchen sink that drains well threw both sinks when the water is on. However, if the water is running and the garbage disposal is on, water shoots up sometimes 2 feet in the air up thru the other sink drain.
    There seems to be no clog in either drain. They both drain when just the water is running. The sink does not have an air valve. Is this the problem? The only other thing that comes to mind is that maybe the drain pipes are not hooked up correctly. Maybe water that is still in the hiorizontal drain pipe from the disposal, shoots up out the other sink drain. Any suggestions on how to fix this?

  2. #2
    Master Plumber-Gas Fitter shacko's Avatar
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    Jan 2006
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    Rosedale, Md
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    Default



    This image shows ckose to how it should be hooked up, that tee in the drain is a baffel tee, thats what keeps one sink from draining into the other; if your hook up a lot different to that post a image and we will get back to you

  3. #3
    DIY Junior Member
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    Jan 2011
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    Arizona
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    Default solution found thank you.

    Thanks for your help. It was a rental house, that had the sink re-installed after new granite countertops. I took the drain apart and found that they had installed the drain T with the baffle backwards| The baffle was pointing up towards the sink drain instead of down towards the trap. I re-insatalled the baffle correctly and had to redo some of the other piping but now it works like a charm. No more shooting water into the air. Fixed and works fine.

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