Febco LF850 QT FZ 3 4 Part of the LF850 Small Series Pipe Connection Fitting Z668 6IC DG Z668 6IC DG This 3 4 inch lead free reduced pressure zone backflow preventer assembly with its exclusive design incorporating the patented air inch and water out principle for protection during an emergency condition prevents the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure Ideal for protection in continuous pressure piping applications and at cross connections identified as non health hazards and for contaminants at the service line entrance irrigation management systems (IMS)