Pressure-activated double-beaded diaphragm to strengthen the seal between the body and bonnet, external bleed, as well as flow control. Lawn genie 150 psi RJ anti-siphon valve with flow control to help prevent irrigation water contaminants from entering the drinking water supply ...MorePressure-activated double-beaded diaphragm to strengthen the seal between the body and bonnet, external bleed, as well as flow control. Lawn genie 150 psi RJ anti-siphon valve with flow control to help prevent irrigation water contaminants from entering the drinking water supply. 3/4" Anti-siphon threaded valve Installs quickly & easily Precise adjust flow to help save water Previously RJ711 The valve's low-voltage 24 vac solenoid with captured plunger and a stainless-steel metering pin are built for durability and longevity.Lessview less