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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. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A reducer reduces the pipe size from a larger to a smaller bore (inner diameter). Alternatively, reducer may refer to any fitting which causes a change in pipe diameter. [15] This change may be intended to meet hydraulic flow requirements of the system or adapt to existing piping of a different size. The reduction length is usually equal to the ...

4. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   Also called John Morris Coupling, BS336 Instantaneous fire couplings are similar in design to the camlock fittings, and are used by; UK, Irish, New Zealand, Indian & Hong Kong fire brigades. They are available in two sizes: 1 + 1 ⁄ 2-inch INST (FETA, only available with 38 mm hose tails) and 2 + 1 ⁄ 2-inch INST (BS336).

5. North American Fire Hose Coupler Incompatibilities - Wikipedia

   en.wikipedia.org/wiki/North_American_Fire_Hose...

   At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 1 ⁄ 2-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...

6. AN thread - Wikipedia

   en.wikipedia.org/wiki/AN_thread

   AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1 ⁄ 16-inch increments. Therefore, a -8 AN size would be equal to 1 ⁄ 2 -inch OD tube.

7. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′. The standard for Nominal Pipe Size (often abbreviated NPS, which should not be confused with the abbreviation NPS for the straight thread form standard) is loosely related to the inside diameter of Schedule 40 series of sizes.