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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.
Quick Answer. An air gap is a vent located between the dishwasher and the main plumbing system to prevent the sewage from siphoning from a plugged or backed-up drain into the machine. In most locations, plumbing codes require installation because the air gap works in all situations. Continue Reading.