an assembly of piping used to connect a gas cylinder to piping and other components that are rigidly attached to a building structure. A pigtail can include one or more piping lines, as well as valves and other components, and normally provides sufficient flexibility to accommodate a slight variation in the location of the cylinder valve . The end of the pigtail that connects to the cylinder terminates in a Compressed Gas Association (CGA) connector. [SEMI Chemicals/Gases, Vol. 1, 1990 (no longer in print)] Also see CGA connection cap or plug.
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