TORO CO M/R IRRIGATION L4034 Anti-Siphon Valve, 3/4-Inch 3/4" Inch Manual Anti-siphon Valve Manually Activates Zone Sprinklers, With The Simple Turn Of A Handle Offers A Jar-top Bonnet For Convenient Access To Diaphragm For Quick Maintenance Inspection Built-in Prevention Is Designed To Protect Drinking, And Other Household Water From Contamination Made from corrosion-resistant PVC