Fixtures & Water HeatersQuestion 220 of 360
An outdoor hose bibb (sillcock) must be protected against backflow by:
a.an expansion tank
b.a pressure-reducing valve
c.an atmospheric or listed hose-connection vacuum breaker
d.a check valve on the water heater
Explanation
A hose bibb can create a cross-connection when a hose is submerged in contaminated water, so it must have a hose-connection vacuum breaker (or be a listed anti-siphon type). This device admits air to break any back-siphonage. It protects the potable supply from garden or utility contaminants.
Law Reference: 2022 California Plumbing Code (CPC) §603.5.7Practice all 360 questions free — no signup required.
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