What is a backflow preventer and where is it located?
A. A backflow preventer is a brass device that prevents any residual water in the irrigation lines from flowing back into the mainhouse water line. There are two types of backflows (RPZ and PVB) and they usually located in two places; in the crawl space or at the street by the water meter. The RPZ-is the most commonly used backflow valve. see photos in picture glossary.
