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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.
Most dishwashers do not have built-in backflow prevention on the drain hose side. This is where the drain air gap device functions; to prevent contamination of the inside of the dishwasher. This type of contamination would occur if there was a kitchen sink drain backup.he Uniform Plumbing Code requires that an air gap device be installed at the countertop level to prevent backflow into the dishwasher. This device prevents backflow by keeping the connection above the fixture flood level rim and having an opening to atmosphere (preventing a siphon affect).