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Thank you all for your comprehensive answers to my question. My research of the applicable code, California Plumbing Code 2001 section 807.4, seems to authorize an air gap or a high loop of the...

Is the installation of a dish washer air gap above the counter a code requirement in Huntington Beach California? I would like to eliminate as many above counter items as possible in my new kitchen...

Here is the solution that my contractor came up with:
Vent the drain by adding copper tubing out of the drain just below the vessel, through the wall, to a height exceeding the height of the...