Danfoss-Flomatic recently introduced a four-color condensed catalog featuring its unleaded backflow preventers. Danfoss-Flomatic's new unleaded material called Enviro-Check® is patented by The Federal Metal Co. This is the industry's first unleaded bronze backflow preventer to receive approval from The Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California, the company said. The new units are designed to protect drinking water from cross-connections and constructed to comply with federal and state laws in California.