Plumber 3 Cross Connection Control Practice Test

When water could potentially flow back into the potable supply from a garden hose, a backflow-prevention device is added at the outlet. For a hose bib, the device that's most commonly used is the hose connection / hose faucet vacuum breaker. This compact fitting screws directly onto the outdoor faucet and provides an atmospheric vent. It stays closed as long as the water is flowing normally, but if a back-siphonage condition occurs, it vents to the air, breaking the siphon and preventing contaminated water from being drawn back into the supply. This makes it the practical, widely used choice for outdoor hose connections. The other options are backflow preventers used in more complex irrigation or plumbing setups and aren’t as commonly installed directly on a simple hose bib.