Featuring a jar-top bonnet for easy access to diaphragm for quick maintenance inspections, this valve has built-in backflow prevention. The built-in prevention is designed to protect drinking and other household water from contamination. The Lawn Genie 3/4” anti-siphon valve manually activates zone sprinklers with the simple turn of a handle and provides optimum performance even in potable or dirty water conditions. (.25-20 GPM flow range; 3/4” female NPT inlet and outlet, must be installed 6-12 inches above highest downstream outlet in sprinkler system.)