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2. Storz - Wikipedia

   en.wikipedia.org/wiki/Storz

   The 100 mm (4-inch) and 125 mm (5-inch) Storz couplers have been specified in NFPA 1963, Standard for Fire Hose Connections, since the 1993 edition. U.S. cities that have fire hydrants with 125 mm Storz connectors include Raleigh, NC [ 5 ] and the City of Corvallis, OR (adapter on 4-inch threaded outlet).

3. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   The "Air King" [14] universal air hose coupling, also known as a "Chicago style" fitting, is malleable iron or brass "quarter turn" "sexless coupling" usually found on large pneumatic tools like jackhammers. [6] The fitting is considered "universal", because a common two-lug head is used on all sizes ranging from 0.25 to 1 inch (6 to 25 mm).

4. AN thread - Wikipedia

   en.wikipedia.org/wiki/AN_thread

   [1] 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. However, this system does not specify the ID (inside diameter) of the tubing because the tube wall can vary in thickness.

5. 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 ...

6. 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.

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, 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. When equipped with self-sealing valves, quick connect fittings will ...