Anti-siphon valves allow water to only flow in one direction. For irrigation purposes, it prevents water from the system from being siphoned back into the
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How to Fix Anti Siphon Valve on Faucet
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Anti-Siphon Valves Preferred Utilities Mfg
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What Is an Anti-Siphon Faucet?
In built-in lawn sprinkling systems, there is a device called an
Rain Bird Anti-Siphon Valves: Basic Operation
What is an anti-siphon? - Quora