Backflow Questions and Answers
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Air Gap - ANSWER-Gap through air between lowest point of water supply &
flood level rim.
i.e. Sink water level & faucet
Anti-Siphon Device - ANSWER-Any device that introduces air into the system
to prevent back siphonage.
AVB (Atmospheric Vacuum Breaker) or PVB (Pressure-type Vacuum Breaker)
Atmospheric Vacuum Breaker (AVB) - ANSWER-Blackflow device that allows
air with use of a float.