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Backflow prevention device
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==Partial list of backflow prevention devices and assemblies== *[[Air gap (plumbing)|Air gap]] (AG the purest form of backflow prevention) *[[Atmospheric vacuum breaker]] (AVB) *[[Check valve]] (usually not a legally approved method of backflow prevention.) *[[Chemigation valve]] (primarily used in agriculture) *[[Double check valve|Double check valve assembly]] (DCVA) *[[Dual check valve]] (A dual check is not a testable device and is mainly used on residential customers) *[[Pressure vacuum breaker assembly]] (PVB) *[[Reduced pressure zone device]] (RPZ) *[[Spill resistant pressure vacuum breaker assembly]] (SPVB) *[[Vacuum breaker]]
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