Anti-siphon valves allow water to only flow in one direction. For irrigation purposes, it prevents water from the system from being siphoned back into the water supply line. Essentially, it stops unsafe water from entering a clean water supply such as the water that comes from your faucets or shower heads.
Accordingly, how does a frost free water spigot work?
Prevent Freezing. To keep the pipe between the shut-off valve and the faucet outside from freezing, a sillcock pipe is drained through a small hole known as a petcock to keep it free of water for winterization. In the older-style faucets, the riser simply drained back down into the water line, creating a back-flow.
What is a vacuum breaker on an outside faucet?
A hose connection vacuum breaker should be installed on each faucet or hose bibb that is connected to the potable water supply to prevent backflow into the water supply.
What is a self draining vacuum breaker?
The VB-222 vacuum breaker valve is designed to prevent dangerous back-siphonage and backflow into a potable water supply system. It automatically self-drains when all attachments are removed completely from the valve's outlet which protects the valve and faucet from freezing and rupturing in cold weather.