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- over 420,000 Posts - PlumbingForum.com -
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Author:
ukdavo (CA)
Here's my tale of woe: I got dishwasher overflow thru the air vent. So I took it apart & cleared out some debris, and figured while I had the drain apart I'd replace my (broken) disposal unit. I bought a new Insinkerator at the local plumbing house, knocked out the 1/2" plug at the dishwasher inlet & hooked everything up. Still have water coming out the vent when the dishwasher runs! I tried replacing the air vent-to-disposal hose with automotive grade hose - there was still a kink where it swept around to the disposal, so I made a "U" out of 3/4 copper - still overflows. The dishwasher drain is hooked up nice and high, not that that should make a difference. The disposal runs into a horizontal tee that drops into a p trap. everything downstream is clear & the sink drains fine. Any ideas? Skip the vent? Any help appreciated. Thanx, Dave.
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Author:
dlh (TX)
it is not a vent it is an air gap.
anyways what you need to do is get all restrictions out of the hose going from it to the disposal. the hose can not be kinked in any way nor can it have anything restricting its path such as the piece of copper you installed or any debris at all inside it
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
hj
The hose from the air gap to the disposer has to be as short as possible, with no "dips" in the line. The overflow has NOTHING to do with the disposer or how the dishwasher drain hose is arranged.
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Author:
jimmy-o (CA)
The hose needs to be 7/8" ID, and a ridgid type so that it holds the circular profile. Since the water flows totally and only by gravity, it is essential that the path be clear. 3/4"copper is acceptalble for turns, as long as the total run is as short as possible, no kinks, no dips.
Double check the knock out on the disposer, to be sure the plug is completely gone.
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Author:
hj
I would suspect the two elbows making a "U" bend as the culprits causing restricted flow.
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Author:
jimmy-o (CA)
I agree. I didn't notice that he said " u-bend". I thought he just meant a curve. I have used one copper ell, and worked ok. But a U is possibly trouble.
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Author:
ukdavo (CA)
Reply to all: Thanks, I get it. I will look for a better type of pipe to run up to the air gap. I appreciate the advice very much. Dave
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Author:
hj
The type of pipe may not be as much of a factor as HOW it is run.
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