13 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