Today, thousands of dollars are spent replacing or fixing stolen or damaged backflow preventer devices and backflow valves. Left unprotected, your backflow device is extremely vulnerable for theft. The Guardian Enclosure cage™ is designed to shield your backflow device safely and aesthetically. A backflow preventer with a security box can protect your company’s backflow device from theft easily.Guardian Enclosure cage™ s are backflow enclosures that are designed for any backflow preventer, whether you use Wilkins Backflow, Watts Backflow, Febco or any others.