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PIPES, VALVES, AND FITTINGS, OF PLASTIC OR METAL, OR A COMBINATION OF BOTH-NAMELY, PIPES FOR THE TRANSMISSION OF FLUIDS AND GASES, ANGLE VALVES, BLEEDER VALVES, BY-PASS VALVES, CHECK VALVES, DRAIN VALVES, FOUR-WAY VALVES, GLOBE VALVES, BALANCING VALVES, DIAPHRAGM VALVES, BALL VALVES, NEEDLE VALVES, BUTTERFLY VALVES, HOIST VALVES, QUICK-OPENING VALVES, REDUCING VALVES, SAFETY VALVES, SHUT OFF VALVES, STOP VALVES, BLOW-OFF VALVES, AND REGULATING VALVES, ELBOW FITTINGS, REDUCING FITTINGS, TEE FITTINGS, UNIONS, PLUGS, BUSHINGS, FLANGES, MADE-UP NIPPLES, VENTS, AND CONTROLS AND ACCESSORIES FOR THE SAME

HEATING RADIATORS, UNIT HEATERS, AND HEAT EXCHANGERS, OF PLASTIC OR METAL, OR A COMBINATION OF BOTH, AND ACCESSORIES THERETO SOLD TOGETHER WITH OR SEPARATELY WITH THE SAME, COMPRISING HEAT CIRCULATING PUMPS, CONDENSATION TRAPS, COMPRESSION TANKS, DUCT WORK, HEAT CIRCULATING FANS AND MOTORS, THERMOMETERS, DAMPENERS, AND HEAT GAUGES; VENTILATING CONDENSING UNITS OF PLASTIC OR METAL, OR A COMBINATION OF BOTH, AND ACCESSORIES THERETO SOLD TOGETHER WITH OR SEPARATELY FROM THE SAME, COMPRISING AIR COOLED OR WATER COOLED COMPRESSORS, VENTILATING FANS AND MOTORS, DUCT WORK, THERMOMETERS, GAUGES, AND DAMPENERS; AND CONTROLS AND ACCESSORIES FOR THE SAME