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Dishwasher Venting and Draining Methods: Air Gap Method-Connecting the drain line to an air gap is one method for installing a dishwasher. In some areas the building codes require that a dishwasher be connected to an air gap installed on the sink.Air gaps are there to keep any contaminants in the drain line from entering the potable water system.ir Gap Method-Connecting the drain line to an air gap is one method for installing a dishwasher. In some areas the building codes require that a dishwasher be connected to an air gap installed on the sink.
When does an under the sink P-Trap assembly need venting? In the realm of second homeowner woes, I had a P-Trap assembly under the bathroom sink. It was a strait connection to the pipe connected to the main sewer line. (least I think that was the case) either way it was not vented and it worked just fine.