Sprinkler Inspection Annual Fire Sprinkler Inspection (1 Wet System) Deficiency: Sprinkler system due for five year internal obstruction inspection Deficiency: Sprinkler system due for a five-year hydrotest of fire department connection. Deficiency: Sprinkler system due for five year internal check fire department connection Check valve Deficiency: Sprinkler system due for gauge Changs will need one gauge