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Main Anti-Siphon Leaking: Redundant with Valve Anti-Siphons?

If zone valves have built-in anti-siphon, main anti-siphon is redundant. Leaking main anti-siphon during operation may mean too many heads per valve. Ensure main valve fully open. Consider redesign with fewer heads per valve.

Irrigation: Why a Sprinkler Head Leaks When the System Is Off: Diaphragm Wear; 85 PSI, 20 GPM: Can Run 10 Rain Bird Pop-Ups? Depends on Nozzles; Rain Bird Anti-Siphon Valve Leaks at Cap Assembly; Evaluating a Sprinkler System Estimate: Hunter vs. Mixed Brands; How Many Hunter I-40 Heads on 1" Line at 65 PSI, 10 GPM?; Weeping Sprinkler Heads: Low Head Drainage vs. Weeping Valve; Why Sprinkler Heads Don't Retract After Watering; Fixing Leaky Sprinkler Heads and Low-Pressure Zones; Weeping Sprinkler Head: Valve Seat or Diaphragm Issue; Diagnosing Low Pressure in a Single Irrigation Zone

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