Rainbird DASASVF100 1 Inch Antisiphon Valve

1 inch, sure flow automatic anti-siphon valve, professional grade, with flow control, reverse flow design helps prevent flooding in the event of internal diaphragm failure, keeping the valve closed & saving water, afeeter installation & before start up, always the flush system of dirt & debris manually using the valve's external bleed screw, adjustable flow control helps prevent wasteful misting when water pressure is too high, a top mounted, easy turn flow control knob allows you to optimize flow to the zone, permitting sprinklers to water at their most efficient rate for more uniform coverage.