An air gap is considered which type of backflow protection?

An air gap is considered which type of

Multiple choice — select the best answer

AThe highest degree of protection, providing a complete physical break in the pipeline
BA mechanical device that closes under back-pressure
CA low-hazard device suitable only for residential use
DA type of check valve installed in the supply line

✓ Correct answer: A. The highest degree of protection, providing a complete physical break in the pipeline An air gap is an unobstructed vertical distance between the water outlet and the flood-level rim of a receiving vessel. It provides the highest degree of protection because it creates a complete physical separation — no mechanical failure can allow backflow.

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Topic: Backflow & Cross-Connection

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An air gap is considered which type of backflow protection?

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