air gaps

An air gap is a physical space of open air between a water source and a potential contaminant, such as a sink drain or dishwasher. It acts as a barrier to prevent contaminated water from flowing back into the clean water supply, ensuring safety. For example, a sink’s drainpipe is often installed with an air gap to stop dirty water from siphoning back into the drinking water line. This simple design helps maintain water purity by providing a visual and physical separation, reducing the risk of waterborne illnesses.