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Old 01-21-2008, 08:04 AM   #1
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Dishwasher vent/air gap


We are getting ready to put in quartz countertops at my GF's place and she has one of those vents sticking out of the top of her sink that vents the garbage disposal near where the dishwasher drain line comes in. We'd like to do away with that if possible. My initial research indicates that it may be possible to do this IF the diswasher drain line has a check valve built into it.

As a reality check, my place just down the road does not have one of these vents. The dishwasher drain line is just plumbed directly into the disposal. My place is a bit newer and perhaps my DW has the check valve?

What are my options?
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Old 01-21-2008, 09:11 AM   #2
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Dishwasher vent/air gap


That check valve (AAV / Studor vent) is probably for the sink drain itself and not for the dishwasher. I would leave it installed and accessible (they do go bad after time).
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Old 01-21-2008, 09:16 AM   #3
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Dishwasher vent/air gap


homer12,
Check with your Building Inspection Department for local code regarding the above-counter air gap for the dw. Some places require one by code, some do not.
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Old 01-21-2008, 09:23 AM   #4
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Dishwasher vent/air gap


Thanks, Mike. Are the codes usually state-wide or do they narrow down to county or municipal levels? Reason I ask is that I don't have one of these at my place and she does. Same state, but different counties and cities. It's also interesting that my old place in my current county had one but my new place doesn't.
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Old 01-21-2008, 11:07 AM   #5
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Dishwasher vent/air gap


As Mike said, this can be a County requirement. Air-gaps were all the rage for awhile but many areas found that they were not really necessary and did away with the requirement. If the DW drainhose is looped to the highest point under the countertop and then ran down to the disposer, I have never seen a problem with siphonage (which is the only reason for the air-gap). All you can do is check with the local Code office.
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Old 01-21-2008, 11:25 AM   #6
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Dishwasher vent/air gap


Thanks for the input, guys. I think we'll nix it, and if there are any issues we can always retrofit.
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