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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.
Thus the need for an air gap. But, the dishwasher already has air an air gap , because it fills from the side. Pendragon, ... the reason for the code is for backflow prvention into the water supply... not to prevent sink water from entering the dishwasher.