Backflow and Sprinkler Inspection Annual inspection of back flow devices. (estimated 2). Annual Inspection of building Wet Sprinkler system. Inoperable Deficiency for Febco 805YB H014642 In pit on entrance driveway at Chick-Fil-A signage: Back Flow by pass failed both tests. No water coming out of test cocks 2 and 3. 4th Test cock the only one that has running coming out. Need a complete rebuild. Inoperable Deficiency for Febco 805YB H014642 In pit on entrance driveway at Chick-Fil-A signage: Back Flow by pass failed both tests. No water coming out of test cocks 2 and 3. 4th Test cock the only one that has running coming out. Need a complete rebuild.