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EQUIPMENT FOR USE IN HOT WATER HEATING SYSTEMS - NAMELY, AIR PURGERS, AIR VENTS, TUBE AND PIPE HANGERS, [FITTINGS, CONNECTORS, FLEXIBLE CONNECTORS, SLIDING EXPANSION JOINTS,] CLIPS AND STRAPS, GUIDE CLIPS, VALVES, FILL VALVES, [CHECK VALVES,] SHOCK SUPPRESSORS, AND WATER HAMMER ELIMINATORS