Backflow Preventer

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  • Household backflow preventers - Inspectapedia - [1]
  • Watts backflow preventer - [2]
  • Water source check valve - [3]

Links

  • Category 1, 2, 3, 4, 5. 4 and 5 are toxic. 1 is single source. 2 and 3 are common for residential. [4].
  • Single check valve can be used for Category 2 [5]
  • DNR Mo webpage [6]. Class 2 requirement - double check valve - [7]
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