Use this Lawn Genie 150 psi RJ Anti-Siphon Valve with Flow Control to help prevent irrigation water contaminants from entering the drinking water supply. This anti-siphon valve features a pressure-activated double-beaded diaphragm to strengthen the seal between the body and bonnet, external bleed, as well as flow control. The valve's low-voltage 24 VAC solenoid with captured plunger and a stainless-steel metering pin are built for durability and longevity.