What is an air gap?
An air gap is a vertical, physical separation between the end of a water supply outlet and the flood-level rim of a receiving vessel. Find more information regarding air gaps.

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1. What is a cross-connection?
2. What is backflow?
3. What is backpressure backflow?
4. What is back-siphonage?
5. Why does the Water / Wastewater Utilities Department need to control cross-connections and protect its public water system against backflow?
6. What should a water supplier do to control cross-connections and protect their public water systems against backflow?
7. What is a backflow preventer?
8. What is an air gap?
9. What is a reduced pressure zone assembly?
10. What is a double-check valve assembly?
11. What is a hose bibb vacuum breaker?
12. Where can I get more information about cross-connection control?
13. Why do backflow preventers have to be tested periodically ?
14. Why does a soft drink dispensing machine require backflow protection?