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PIPE FITTINGS, VALVES, AUTOMATIC SPRINKLER SYSTEMS, SPRINKLERS AND ACCESSORIES THEREFOR, DRY-VALVE ACCELERATORS, PRESSURE ALARM SIGNAL DEVICES, FLOW ALARM SIGNAL DEVICES, BY-PASS CONNECTIONS, SIGHT DRIP CONNECTIONS, MERCURY GAUGES, INDICATOR POSTS, RETARDS, RETARDING CHAMBERS, WATER MOTORS, SPRAY PIPES, HOSE CAPS, QUARTZOID BULB LINKS, PIPE HANGERS AND SUPPORTS