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2. Crescent (brand) - Wikipedia

   en.wikipedia.org/wiki/Crescent_(brand)

   Crescent is a brand of hand tools. It originated with the Crescent Tool Company, founded in 1907. The Crescent brand has changed ownership multiple times. It is currently owned by Apex Tool Group, LLC of Sparks, Maryland as part of its Hand Tools division. It is best known for its style of adjustable wrench. [1] [2]

3. Coupling (piping) - Wikipedia

   en.wikipedia.org/wiki/Coupling_(piping)

   Examples of adapters include one end BSP threaded with the other NPT threaded, and one end threaded with the other a plain socket for brazing. A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling.

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A reducer reduces the pipe size from a larger to a smaller bore (inner diameter). Alternatively, reducer may refer to any fitting which causes a change in pipe diameter. [15] This change may be intended to meet hydraulic flow requirements of the system or adapt to existing piping of a different size. The reduction length is usually equal to the ...

5. Pipe wrench - Wikipedia

   en.wikipedia.org/wiki/Pipe_wrench

   A pipe wrench is any of several types of wrench that are designed to turn threaded pipe and pipe fittings for assembly (tightening) or disassembly (loosening). The Stillson wrench, or Stillson-pattern wrench, is the usual form of pipe wrench, especially in the US. The Stillson name is that of the original patent holder, who licensed the design ...

6. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   spanner (wrench) size and thread diameter of a hex nut. Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces

7. Glossary of firefighting equipment - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_firefighting...

   A forcible entry tool for removing cylinder locks; used with a Halligan bar. It is a larger version of a K-tool. Rabbit tool Hydraulic spreading tool that is specially designed to open doors that swing inward. [15] Red line See booster hose Reducer Adapter used to attach a larger diameter source hose to a smaller diameter receiving hose.