30-A        LOCK SHIELD VALVES

30-B        GATE VALVES

30-C        CHECK VALVES

30-D        PRESSURE REDUCING VALVES

30-E         PRESSURE REDUCING STATION

30-F         ZONE CONTROL VALVE STATION

30-G        PRESSURE GAUGES

30-H        BUTTERFLY VALVE

30-I         WATER FLOW SWITCH

30-J         VALVE SUPERVISORY SWITCH

30-K        AIR VENT