Backflow Preventer
From Open Source Ecology
- 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]