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What is the difference between a backflow prevention device and a backflow prevention assembly?

April 26, 2017assembly backflow device difference prevention

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What is the difference between a backflow prevention device and a backflow prevention assembly?

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Backflow prevention devices are installed at a building’s taps and are not testable. Backflow prevention assemblies are installed at a building’s water service connection and is testable and repairable. Examples of backflow prevention assemblies include a reduced pressure zone assembly and a dual check valve assembly. Examples of a backflow prevention device are a hose-bibb vacuum breaker, atmospheric vacuum breaker, or dual check with atmospheric vent.