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I've noticed in another place a claim that there is now, in many states, no code requirement for using an air gap with a dish washer drain. The only requirement now is for a high-loop in the D/W drain pipe. Any comments?
If your local code requires one, you need one. Haven't really looked into styles of what's available. It doesn't have to be installed on the sink deck, it can be anywhere on the counter but that requires an additional hole.
Modern dishwashers will usually have the high loop already installed on the appliance itself
This is awkward, but...
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