The Pressure Vacuum Breaker (PVB) protects against back-siphonage — the scenario where a drop in supply pressure sucks irrigation water backward. It's common on residential and light-commercial sprinkler systems.
PVBs are simpler than RP assemblies, but they still wear, and they still require an annual certified test where your purveyor mandates one. A quick checkup keeps you compliant and your irrigation honest.
In-ground irrigation systems on homes and light-commercial properties where back-siphonage is the main risk.
California Title 17 (and Sacramento-region purveyors) require this assembly to be tested and certified by a registered tester once a year, with the result filed with your water district.
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