What is an air gap?

An air gap is defined as an open vertical distance between the drinking potable water supply and any potentially contaminated source or non-potable water. This gap serves as a critical barrier to prevent contamination of the potable water supply, ensuring that there is no direct connection that could allow contaminants to flow back into the drinking water. The air gap is a fundamental concept in plumbing and water safety, particularly in the design of systems that prevent backflow, which can occur due to changes in pressure or other factors.

In plumbing systems, maintaining this air gap is vital for compliance with health and safety regulations. It is an effective way to safeguard public health by providing a physical separation that cannot be compromised, unlike mechanical devices that may fail or require maintenance. Understanding this principle is essential for those working in utility maintenance, as it ensures the integrity and safety of the water supply.