Texas Irrigator License Exam 2020: Backflow updated already passed

Texas Irrigator License Exam 2020: BackflowAir Gap - correct answer Gap through air between lowest point of water supply & flood level rim. i.e. Sink water level & faucet Anti-Siphon Device - correct 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) - correct answer Blackflow device that allows air with use of a float. Shape: Like an L Back Pressure: No Constant Pressure: No more than 12 hrs in 24-hr period. Install Height: Vertically with min of 6" higher than all downstream piping and highest downstream head. Install: No shut-off valves downstream. Must be on discharge side of each control valve.