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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.
Turn off the water to the dishwasher. You can find the supply valve beneath the kitchen sink; turning the valve handle clockwise turns off the water. Find the dishwasher drain hose connection beneath the sink. It could attach to the garbage disposal, the sink drain pipe or an air gap. An air gap is a small cylindrical fixture that prevents the back flow of dirty water into the dishwasher; it sits on the countertop behind the sink and has a small vent and a pipe that extends beneath the counter.