SafetyQuestion 343 of 360
The most common cross-connection in a home is an outdoor hose faucet, where a hose can be left in a pool, sink, or chemical bucket. What inexpensive device protects against backsiphonage there?
a.A pressure-reducing valve
b.A hose bibb (atmospheric) vacuum breaker
c.A dielectric union
d.A water hammer arrestor
Explanation
An atmospheric vacuum breaker screwed onto a hose bibb admits air to break the siphon if supply pressure drops, preventing contaminated water from being drawn back through the hose. It is the standard low-cost protection for outdoor faucets and is required on hose connections by the California Plumbing Code. A pressure-reducing valve or hammer arrestor does not stop backflow.
Law Reference: California Plumbing Code §603Practice all 360 questions free — no signup required.
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