Champion CL466 Series Automatic Anti-Siphon Valves provide back-flow protection to protect your water supply and automatic operation with connection to irrigation timer. Available models include:Find the VALV+UNION WATR3/4A SIPH at Ace.
Underground Sprinkler Valves - Ace Hardware
SharkBite 1/2 in. PEX X 1/2 in. D PEX Brass Elbow - Yahoo Shopping
Rainbird Anti Siphon Valve
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Lawn Genie - 54000 - Anti-Siphon Valve 3/4 in. 150 psi
Rain Bird 3/4 in. FPT Professional Grade Anti-Siphon Irrigation
CHAMPION IRRIGATION PD 466P-075Y Brass Anti-Siphon
Rain Bird 3/4 in. FPT Professional Grade Anti-Siphon Irrigation
Champion Angle Valve 3/4 in. 150 psi