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The air line is connected upstream of the backflow preventer
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Sprinkler Backflow Preventer Diagram - General Wiring Diagram
Sprinkler Backflow Preventer Diagram - General Wiring Diagram
Backflow Prevention - Prevent the Reversal of Flow
The air line is connected upstream of the backflow preventer
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Backflow Preventers: The Hero Of Your Sprinkler System | Sprinkler School