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2. Coupling (piping) - Wikipedia

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

   Alternatively it is a short length of pipe with two female National pipe threads (NPT) (in North American terms, a coupler is a double female while a nipple is double male) or two male or female British standard pipe threads. If the two ends of a coupling are of different standards or joining methods, the coupling is called an adapter. Examples ...

3. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   The fitting is known as a reducing coupling, reducer, or adapter if their sizes differ. There are two types of collars: "regular" and "slip". A regular coupling has a small ridge or stops internally to prevent the over-insertion of a pipe and, thus, under-insertion of the other pipe segment (which would result in an unreliable connection).

4. Cam and groove - Wikipedia

   en.wikipedia.org/wiki/Cam_and_groove

   Type B or Type VII: coupler (female end) with male thread, e.g. BSP or NPT; Type C or Type VI: ... 2 + 1 ⁄ 2: 64 3 76 4 102 5 127 6 152 7 178 8 203 Gallery. See also

5. North American Fire Hose Coupler Incompatibilities - Wikipedia

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

   1 + 1 ⁄ 2-inch hose with 1 + 1 ⁄ 2-11.5NPSH ASME threads instead of NFPA threads in the U.S. and Canada, without any regulation specifying its use, and contrary to NFPA 1963. [9] This is perhaps a direct result of the 1918 War Industries Board recommendation noted above, combined with 1 + 1 ⁄ 2 -inch 1.5-9 NH NFPA couplings not being ...

6. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   Side view of a 1.5 to 2.5 inches (38 to 64 mm) adapter. ... is a quick connect fluid transfer hose coupling that consists of a male "adapter" and female "coupler".

7. Air-line fitting - Wikipedia

   en.wikipedia.org/wiki/Air-line_fitting

   A female coupler is used on the supply side, and a male nipple is used on the receiving side. ... Tru-Flate/Automotive 1/2" 10 G German/Walther 12 12 200.12 57 LP-012 ...