What is an Atmospheric Vacuum Breaker (AVB)?
An AVB consist of an air inlet valve, a check seat, and an air inlet port(s). If installed properly, the air inlet opens allowing air into the body of the device which compensates for any vacuum and separates the downstream non-potable water from the upstream potable water.

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1. What types of backflow conditions exist?
2. What is Backsiphonage?
3. What factors can cause backsiphonage?
4. What is backpressure?
5. What factors can cause backpressure?
6. What is a cross connection?
7. What is the most common form of a cross connection?
8. What is an Atmospheric Vacuum Breaker (AVB)?
9. Will an Anti-Siphon Vacuum Breaker protect against backpressure?
10. What is continuous pressure?
11. Can an AVB be used under continuous pressure?
12. What is a Hose Bibb Vacuum Breaker (HBVB)?
13. Can I tie my lawn irrigation/sprinkler system to my outside AVB or HBVB?
14. If I have an existing lawn irrigation/sprinkler system do I need a backflow preventer?
15. If I have a new lawn irrigation/sprinkler system do I have to have a separate irrigation meter?
16. When do I need to get a backflow permit? Do I also need a Plumbing Permit?
17. As a homeowner, can I install my own backflow preventer?
18. Do I need a plumbing permit to install a backflow preventer?
19. What if I have a commercial property or I just don’t feel comfortable doing the work myself, who can I hire?
20. How do I become a certified backflow tester in Durham?
21. Are re-certification classes every 2 years necessary?
22. Why can’t we have one universal State backflow testing form for each jurisdiction?
23. What if I want to test backflows outside of Durham?
24. Why do I have to be a properly licensed contractor to test backflows in Durham?
25. How often do I have to test my backflow preventer?
26. My meter has been locked by Cross Connection (bright colored laminated tag) for non-compliance. How do I get it unlocked?
27. What if I have a temporary use that requires a backflow preventer assembly, do I have to get a permit, inspection, etc.?
28. How do I pay for backflow permits, re-inspection fee, CCC Plan Review, Work without permit, CCC Class Enrollment, and any other associated fee with Cross Connection?
29. What does it take to be ASSE 1060-Certified for Freeze Protection Insulated Enclosures?