Rain Bird DASASVF075 — 3/4-Inch Anti-Siphon Valve

What is it and what's it for?

Unlike an in-line valve that's buried underground (like the Orbit valve in this ranking), this one mounts above ground level, usually screwed directly onto a spigot — it has a built-in 'vacuum breaker' that keeps irrigation water (with dirt, fertilizer) from siphoning back into the potable water supply.

Real-world use cases

• At home: You install it directly on your home's outdoor spigot, visible and easy to inspect, instead of buried underground — ideal if you'd rather be able to check or repair it without digging.
• In a business or workshop: An irrigation installer working in areas where plumbing code requires visible backflow protection near the water source can use this type of valve to meet the requirement without installing a separate device.

How to avoid buying the wrong one

• It mounts above ground level (typically on a spigot), not buried like the in-line valve in this ranking — confirm which one your installation needs.
• It has a built-in vacuum breaker — in many areas it's required by code if the valve sits near a potable water source.
• 3/4" thread and standard 24V AC — compatible with any controller, not just Rain Bird's own.