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2. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   The reduction length is usually equal to the average of the larger and smaller pipe diameters. Although reducers are usually concentric, eccentric reducers are used as needed to maintain the top- or bottom-of-pipe level. A reducer can also be used either as a nozzle or diffuser, depending on the mach number of the flow. [citation needed]

3. Electrical conduit - Wikipedia

   en.wikipedia.org/wiki/Electrical_conduit

   It is a new type of plastic wire conduit in the industry. Compared with PVC electrical conduit, it has three advantages. First: low smoke. Due to the unique material and formula, LSZH conduit only produces a small amount of black smoke when burning, and most compounds will absorb heat energy and release steam when burning.

4. Nipple (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Nipple_(plumbing)

   A close nipple can only be unscrewed by gripping one threaded end with a pipe wrench which will damage the threads and necessitate replacing the nipple, or by using a specialty tool known as a nipple wrench (or known as an internal pipe wrench) which grips the inside of the pipe, leaving the threads undamaged. When the ends are of two different ...

5. Street elbow - Wikipedia

   en.wikipedia.org/wiki/Street_elbow

   Street elbows are available with bend angles of 90°, 45°, and 22.5°. They can be used in many plumbing applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump pump drains, and other locations where plumbing fittings would be used to join sections of pipe.

6. Bushing - Wikipedia

   en.wikipedia.org/wiki/Bushing

   Bushing (electrical), an insulated device that allows a conductor to pass through a grounded conducting barrier; Bushing (isolator), a mechanical device used to reduce vibrational energy transfer between two parts; Drill bushing, a tool used to guide the placement of a hole when drilling in a workpiece; Threaded bushing, a metal sleeve with ...

7. Bushing (electrical) - Wikipedia

   en.wikipedia.org/wiki/Bushing_(electrical)

   In electric power, a bushing is a hollow electrical insulator that allows an electrical conductor to pass safely through a conducting barrier such as the case of a transformer or circuit breaker without making electrical contact with it. Bushings are typically made from porcelain, though other insulating materials are also used.