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2. 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).

3. Air-line fitting - Wikipedia

   en.wikipedia.org/wiki/Air-line_fitting

   Fitting profiles have identifiable geometry on the male end, but care must be taken to use a compatible coupler. Couplers use springs and balls to lock mating nipples into place. A seal is effected using O-rings along the shaft of the nipple or by compression by the tip.

4. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   National pipe straight–coupling: ... and 6 inch, as pipe and fittings by most US suppliers. Sizes smaller than 1 ... 2 + 5 ⁄ 8: 66.6750 3 8 0.12500000 ...

5. American Concrete Institute - Wikipedia

   en.wikipedia.org/wiki/American_Concrete_Institute

   The American Concrete Institute (ACI, formerly National Association of Cement Users or NACU) is a non-profit technical society and standards developing organization. ACI was founded in January 1905 during a convention in Indianapolis.

6. Coupling - Wikipedia

   en.wikipedia.org/wiki/Coupling

   A sleeve coupling consists of a pipe whose bore is finished to the required tolerance based on the shaft size. Based on the usage of the coupling a keyway is made in the bore in order to transmit the torque by means of the key. Two threaded holes are provided in order to lock the coupling in position. Sleeve couplings are also known as box ...

7. Tremie - Wikipedia

   en.wikipedia.org/wiki/Tremie

   The tremie concrete placement method uses a vertical or nearly vertical pipe, through which concrete is placed by gravity feed below water level. [4]The lower end of the pipe is kept immersed in fresh concrete so that concrete rising from the bottom displaces the water above it, thus limiting washing out of the cement content of the fresh concrete at the exposed upper surface.