What is a double-check valve assembly?
A double-check valve assembly is a testable backflow prevention device that incorporates an assembly of check valves, with shut-off valves at each end and appurtenances for testing.

For instance, sprinkler and irrigation systems are required to be protected by these devices. They are normally installed near the meter in an underground box.

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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?