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2. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   Hose link is a 1/4-turn bayonet-mount garden hose connection, which uses an o-ring to o-ring seal. It was designed by Hoselink, Pty, Ltd., Australia, [24] and patented in 1998. [25] It is popular in Australia, with limited distribution in the UK and the US, where it is distributed by Dayco Products, Inc.

3. North American Fire Hose Coupler Incompatibilities - Wikipedia

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

   1-inch hose with 1-8 NH NFPA threads (NFPA 1963 requirement; a.k.a. "Chemical Hose Thread" and "Booster Hose Thread" [7]; the chemical hose thread term likely originates from its use on chemical fire engines, an early firefighting device used from 1872 until the 1930s that used a combination of bicarbonate of soda and sulfuric acid to force ...

4. Concentric reducer - Wikipedia

   en.wikipedia.org/wiki/Concentric_reducer

   A concentric reducer is used to join pipe sections or tube sections on the same axis. [1] The concentric reducer is cone -shaped, and is used when there is a shift in diameter between pipes. [ 1 ] For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level. [ 2 ]

5. Vacuum tube - Wikipedia

   en.wikipedia.org/wiki/Vacuum_tube

   Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] thermionic valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

6. Stainless steel - Wikipedia

   en.wikipedia.org/wiki/Stainless_steel

   In particular, the electrical contact resistance (ECR) of stainless steel arises as a result of the dense protective oxide layer and limits its functionality in applications as electrical connectors. [11] Copper alloys and nickel-coated connectors tend to exhibit lower ECR values and are preferred materials for such applications.