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Air Gap

Air-filled space allowing contaminated water to discharge freely, preventing the contaminated water from ever siphoning back into the potable water supply.
A device mounted at the back of a kitchen sink, connecting to the drain line between a dishwasher and disposer to allow the dishwasher to discharge freely into the disposer while preventing contaminated water from siphoning back into the dishwasher. Can be any unobstructed vertical opening between the lowest opening of a waste line and the flood level of the device into which it empties to relieve pressure and prevent backflow contamination.

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