Thieves are stealing backflow valves because they are easy to get to and replacement costs can be as high as $3900 for each one. Pay a little now for a secure solution and save a lot of stress, time, and money. Mounted directly to the wall and held in place by security bolts and anchors, the lockbox has service openings which allow the device to be tested for pressure and to be winterized, a necessary maintenance procedure in the northern states where irrigation is not needed year round.