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2. 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 ...

3. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   Side view of a 1.5 to 2.5 inches (38 to 64 mm) adapter. National Hose thread (NH), also known as National Standard Thread (NST). It is the most common type of fire hose coupling used in the United States.

4. Railway coupling - Wikipedia

   en.wikipedia.org/wiki/Railway_coupling

   9.1.2 Bazeley coupler. ... They are simply pressed together and sealed by rubber elements. ... based the Schwab coupler, a possible replacement of the screw couplers ...

5. 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).

6. Air-line fitting - Wikipedia

   en.wikipedia.org/wiki/Air-line_fitting

   Also known as pneumatic couplings, quick disconnects, air couplers, ... US Industrial 1/2" HP 11 ISO 6150C 170.11 471 Tru-Flate/Automotive 1/2" 10 G

7. Quick connect fitting - Wikipedia

   en.wikipedia.org/wiki/Quick_connect_fitting

   For hoses and piping, a quick connect fitting, also called a push fitting or Quick Connect Coupling, is a coupling used to provide a fast, make-or-break connection of gas or liquid transfer lines. Operated by hand, quick connect fittings replace threaded or flanged connections , which require wrenches.