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Backflow Prevention
A backflow preventer is a means or mechanism to prevent backflow. The basic means of preventing backflow is an air gap, which either eliminates a cross-connection or provides a barrier to backflow. The mechanism for preventing backflow is a mechanical backflow preventer, which provides a physical barrier to backflow.

Type of Backflow Preventers
The principal types of mechanical backflow preventers are:
  • Double check valve assembly
  • Pressure vacuum breaker assembly
  • Reduced-pressure principle assembly

A secondary type of mechanical backflow preventer is the residential dual check valve.

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