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Piping or tubing is usually inserted into fittings to make connections. Connectors are assigned a gender, abbreviated M or F. An example of this is a "3 ⁄ 4-inch female adapter NPT", which would have a corresponding male connection of the same size and thread standard (in this case also NPT).
The origin is debated, but the earliest patents related with plugging the pipes date back to the 1890s. The first patent for a pipe plug as we know today is by Oscar F. Anderson, published in 1952., [3] and the first patent for inflatable plugs was published in 1965 [4]
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 ...
Pipe coupling (copper sweat) In piping and plumbing, a coupling (or coupler) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (), brazed or soldered (copper, brass etc.) together.
Many of these plugs are derived from the "double banana" plug, which consists simply of two banana plugs spaced 3 ⁄ 4 inch (19 mm) apart (measured from center to center of each individual plug). The 3 ⁄ 4 inch spacing originated on General Radio test equipment during the 1920s, and their type 274-M dual-plug is a notable example from that ...
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