Use the GroundWork Anti-Siphon Valve to maintain correct water flow in your hose or irrigation system. It functions as a vacuum breaker, preventing backflow and associated problems. It rapidly inhales air when the system generates a vacuum or is about to generate a vacuum, thus destroying the vacuum state and preventing backflow contamination due to siphonage. This avoids polluting water sources or damage to piping. Made from solid and durable brass, our anti-siphon valve is built for lasting performance you can depend on. For more gardening solutions, shop GroundWork's complete selection of hose connectors and accessories.