What is a reduced pressure zone assembly?
A reduced pressure zone assembly is an approved testable backflow prevention device incorporating: 2 or more check valves; an automatically operating differential relief valve located between the 2 checks; 2 shut-off valves; and necessary appurtenances for testing.

A sprinkler and irrigation system that has a chemical feed requires this device. It is also commonly used in commercial establishments to protect against numerous contaminants. These devices must be installed above ground.

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1. What is a cross-connection?
2. What is an air gap?
3. What is a reduced pressure zone assembly?
4. What is a double-check valve assembly?
5. What is an atmospheric vacuum breaker?
6. What is a pressure vacuum breaker?
7. What is a hose bibb vacuum breaker?
8. Why do backflow preventers have to be tested periodically?