Sprinkler Inspection Annual Sprinkler Inspection Deficiency: Sprinkler system due for gauge change. 2- 300# air/water gauges Deficiency: Sprinkler system due for five year internal obstruction investigation found. 2- Victaulic couplings Deficiency: Sprinkler system is due for a five-year internal check of fire department connection check valve and system alarm check valve. 2- Victaulic couplings Deficiency: Sprinkler system is due for five year Hydro test on fire department connection.