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Pin-Index Safety System

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.01 sec.
Pin-Index Safety System (PISS),
a system for identifying connectors for certain small cylinders of medical gases that have flush valve outlets rather than threaded outlets. The identifying code consists of a specific combination of two holes in the face of the valve into which connecting pins for a particular type of gas must fit in perfect alignment. For example, the index hole position for a cylinder of oxygen is 2-5, for nitrous oxide it is 3-5, and so on. See also Diameter-Index Safety System.


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