What is the purpose of an outdoor faucet anti siphon valve and how does it help prevent water contamination in your plumbing system?

An outdoor faucet anti-siphon valve is designed to prevent contaminated water from being drawn back into the Plumbing system. It helps maintain the integrity of the water supply by creating a barrier that stops water from flowing in the wrong direction, thus preventing potential contamination from sources like garden hoses or irrigation systems.