Annual Sprinkler System Inspection Annual Anti-Freeze System Inspection Deficiency: Recommend installing a backflow preventer and put a lock on valve at antifreeze loop system which covers the retail case cooler. This is to prevent water from going into antifreeze loop system to prevent from freezing pipes 3” backflow preventer Need lift and threader for groove 2- 3” Victaulic couplings 2 technicians