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2. Coupling (piping) - Wikipedia

   en.wikipedia.org/wiki/Coupling_(piping)

   A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling. An example is a 3/4" NPT to 1/2" NPT coupling.

3. Compression fitting - Wikipedia

   en.wikipedia.org/wiki/Compression_fitting

   A compression fitting 15 mm isolating valve. A compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. . In instances where two pipes made of dissimilar materials are to be joined (most commonly PVC and copper), the fittings will be made of one or more compatible materials appropriate for the connect

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   [21]: 149 Although the fittings are not cheap, they are reasonably durable (the rubber is typically neoprene or flexible PVC). An alternative design also allows the selective use of belled fittings made entirely of flexible rubber, including more-complex shapes such as wyes or tee-wyes.

5. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   This coupling is used by Spanish firefighters, and is defined by Spanish Standard UNE 23400. [15] It is a sexless coupling with three engaging lugs, and is available in several different sizes, including Barcelona 25 (25 mm hose ID), Barcelona 45 (45 mm hose ID), and Barcelona 70 (70 mm hose ID). Suitable for delivery (pressure) only, not suction.

6. Push-to-pull compression fittings - Wikipedia

   en.wikipedia.org/wiki/Push-to-pull_compression...

   A push-in compression coupling and tee.. Push-to-pull, push-to-connect, push-in, push-fit, or instant fittings are a type of easily removed compression fitting or quick connect fitting that allows an air (or water) line to be attached, nominally without the use of tools (a tool is still usually required for cutting tubing to length and removal).

7. Electrical conduit - Wikipedia

   en.wikipedia.org/wiki/Electrical_conduit

   Flexible metallic tubing (FMT; North America) is not the same as flexible metallic conduit (FMC) which is described in US National Electrical Code (NEC) Article 348. FMT is a raceway, but not a conduit and is described in a separate NEC Article 360. It only comes in 1/2" & 3/4" trade sizes, whereas FMC is sized 1/2" ~ 4" trade sizes.