What is a backflow preventer?
Backflow preventers are mechanical plumbing devices installed in a plumbing system to prevent water from flowing backward in the system. A properly installed, tested and maintained backflow preventer at the service entrance to a building or property can reliably prevent the backflow of water of an unknown quality from flowing back into the community water system.

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1. What is a backflow preventer?
2. Are all backflow preventers the same?
3. What are the different types of backflow preventers?
4. What type of maintenance do backflow preventers require?