An anti-siphon valve is an essential irrigation part that should not be left off your shopping list. Our brass anti-siphon valve with flow control helps prevent irrigation water contaminants from entering the main water supply. With its heavy-duty cast brass construction, you are sure to feel how strong and reliable it is to work with this valve as you effortlessly use the valve for your needs. Easily connect your anti-siphon valve to PVC, or replace any big brand valves you may have. Its 3/4 in. female connections make it easy and practical to use in every irrigation system you may have. Please keep in mind that Anti-Siphon valves should always be installed at least 6 in. above the highest head on the valve line, and should never have another valve installed further down the line from the main valve. Please keep in mind that this is not an electric control valve, this valve should be between the water supply and your sprinkler valve manifold. After installation and before startup, always the flush system of dirt and debris manually using the valve's external bleed screw. For outdoor use only/ cold water only.