An air gap is a safety feature in plumbing systems that prevents backflow and contamination of potable water. It is essentially a physical gap, usually about one to two inches, between the water outlet and the overflow level of a fixture. This gap ensures that contaminated water cannot siphon back into the clean water supply if there is a sudden drop in pressure. Air gaps are commonly used in dishwashers, sinks, and water softeners to maintain water safety and comply with plumbing codes. For example, in dishwashers, an air gap is often a small device mounted on the sink or countertop that prevents wastewater from flowing back into the clean water supply. It is one of the most effective and reliable methods of backflow prevention.
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