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  Reduced Pressure Principle Assembly
   
 
Reduced Pressure Principle Assembly Reduced Pressure Principle Assemblys (RP) protect against backpressure and backsiphonage of pollutants and contaminants.

This backflow prevention assembly is used to protect against high-hazard contaminants and is the only approved assembly when applying fertilizers and chemicals via the irrigation system, or when using a secondary water system with the culinary water system in the irrigation system.
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The RP should be installed as follows:

  1. The assembly is not to be installed in a pit or in a location where any part of the assembly could become submerged in standing water.
  2. The assembly is to be installed a minimum of 12 inches above grade.
  3. Install in an accessible location for servicing and inspection "which is to be done yearly by a state certified tester."
  4. Protect the assembly from freezing by properly installing it in a utility box or shelter and draining it in the winter months when the system is not in use.

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