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I don't understand how a faulty grinder or pump would result in the increase in water pressure draining from the dishwasher. Speedball1, could you explain that to this novice?

I haven't tried restricting the drain hose yet but that's my next step. I'll post the results when I'm done. Thanks for all the input.

I've replaced the old air gap with two different types and same result. No kink and the 7/8" hose is downward sloped. Already addressed these. Any other ideas?

There are no kinks in the 7/8" hose and the correct outlets on the air gap are hooked up correctly. Small inlet from the dishwasher and larger outlet to the disposal. Knockout plug is not present as...

Yes local code here requires the air gap. If I was staying in the house I'd solve it with your solution but we're preping to sell soon and it'll have to pass inspection so I'd rather take care of it...

Haven't changed dishwasher. Same as when we moved in, but we were having this issue then too. I've replaced the original air gap with two new ones, the first the same style and the second a different...

Ok I just conducted a little experiment and now I have no idea what the problem is. I disconnected the large hose at the disposal so that it was still connected to the air gap vent. I put the...

I have had the usual symptomatic water overflow out of the dishwasher air gap on the top of my sink countertop. After replacing the countertop with granite and relocating the air gap hole, I replaced...