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2. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   The standard for this kind of coupling is EN14420-8/NF E 29-572, and there is a special standard DIN14420-8 for unique assemblies with ferrule and safety clamp. 45 mm and 70 mm diameter fire hoses, with Guillemin couplings installed. Guillemin couplings are available in the following sizes (unit: mm): Guillemin 20; Guillemin 25; Guillemin 40 ...

3. 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 ...

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Most threaded-pipe systems require strategically located pipe-union fittings in final assembly. The threaded pipe is heavy and requires adequate attachment to support its weight. To ensure a comprehensive pressure test, it is crucial to explicitly request a 3.1 certificate in accordance with EN HFF 10204:2004.

5. Rivet - Wikipedia

   en.wikipedia.org/wiki/Rivet

   The most common machine is the impact riveter and the most common use of semi-tubular rivets is in lighting, brakes, ladders, binders, HVAC duct-work, mechanical products, and electronics. They are offered from 1/16-inch (1.6 mm) to 3/8-inch (9.5 mm) in diameter (other sizes are considered highly special) and can be up to 8 inches (203 mm) long.

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7. Chimney - Wikipedia

   en.wikipedia.org/wiki/Chimney

   An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method of regulating draft in situations where prevailing winds or turbulences cause downdraft and back-puffing. Although the H cap has a distinct advantage over most other downdraft caps, it fell out of favor because of its bulky design.