The Reduced Pressure (RP) assembly is the workhorse of high-hazard protection. It uses two independent check valves plus a relief valve, so even if both checks fail, contaminated water is dumped to the ground rather than pulled back into the drinking supply.
Because it guards against the worst-case hazards, the RP is what most commercial buildings, irrigation systems with chemical injection, and properties with boilers or process equipment are required to have — and California Title 17 requires it tested and certified annually.
Commercial properties, sites with chemical injection (fertigation), boilers, medical/lab equipment, or any high-hazard cross-connection.
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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