Air Gap is defined as:

Air Gap is defined as:

• A. A physical separation between the water source and the rim of the tank or container to prevent backflow.
• B. A pipe that returns water to the source after mixing.
• C. A device that vents air into the line.
• D. A chemical that reduces backflow risk.

Answer: (A)

Air gap is a simple backflow prevention method that uses a physical open space between the water outlet and the receiving container to prevent contaminated liquid from flowing back into the clean water supply. The best description is the physical separation between the water source and the rim of the tank or container, creating an air break so there’s no continuous pipe connection that could allow backflow if pressure changes. This open space stops siphoning by physically breaking the path back to the source. The other ideas describe a line that returns water to the source, a venting device, or a chemical additive, none of which provide the necessary air break. In pesticide work, this is crucial during mixing and filling to protect the clean water supply from contamination.

Air gap is a simple backflow prevention method that uses a physical open space between the water outlet and the receiving container to prevent contaminated liquid from flowing back into the clean water supply. The best description is the physical separation between the water source and the rim of the tank or container, creating an air break so there’s no continuous pipe connection that could allow backflow if pressure changes. This open space stops siphoning by physically breaking the path back to the source. The other ideas describe a line that returns water to the source, a venting device, or a chemical additive, none of which provide the necessary air break. In pesticide work, this is crucial during mixing and filling to protect the clean water supply from contamination.