Irritrol 2709PR 1" Manual Anti-Siphon Valve offers optimum performance, reliability and ease-of-use for a wide variety of residential applications. Featuring anti-siphon capability, this family of plastic valves also features flow control for precise flow adjustment, manual shutoff and a built-in atmospheric vacuum breaker to eliminate back siphonage. Available in electric and manual models, these valves also feature a flow range from .25 to 30 GPM and a pressure range from 10 to150 psi.