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2. Headset (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Headset_(bicycle_part)

   The larger diameter of the head tube and headset gives added stiffness to the steering portion of the bicycle. Common sizes. 25.4 mm (1 in) steerer tube, this may have a fork crown (the base of the fork steerer tube) of a number of different dimensions, and milling may be necessary to make some headsets fit. 26.4 mm crown race (ISO standard)

3. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Fittings allow multiple pipes to be connected to cover longer distances, increase or decrease the size of the pipe or tube, or extend a network by branching, and make possible more complex systems than could be achieved with only individual pipes. Valves are specialized fittings that permit regulating the flow of fluid within a plumbing system.