What is a backflow prevention device and which one is best to install?
Backflow prevention in a drinking water system is an in-line assembly that is used to keep undesirable water from entering the drinking water system during a backflow event. Your plumber will be able to assist you with the correct device for your system. Generally, for residential water systems, a non-testable dual check valve assembly is adequate.
DEVICE TYPE TABLE BASED ON WATER USE AND DEGREE OF HAZARD