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The Compressed Gas Association (CGA) developed the Diameter-Index
Safety System (DISS) to establish a standard for non-interchangeable,
removable connections for use with Medical Gases (200 psi max.),
Vacuum (Suction), and Evacuation Service. Non-interchangeable indexing
is achieved by a series of increasing and decreasing diameters in
the components of the connections. These specific diameters act
in a key-like fashion, so the fittings within the gas service "family"
(suction & evacuation included) will connect only with their
own "family members".
In place of diameter indexing, Oxygen (DISS 1240) has been assigned
the long established 9/16"-18 thread connection as its safety
standard.
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Each DISS connection consists of a Body Adaptor, Nipple, and Nut
(Fig. 1). As the diameters of the Body Adaptor (A & B) increase/decrease
proportionally. In this way, only properly mated and intended parts
fit together to permit thread engagement (Fig. 2).
The DISS system is utilized on gas pressure regulator outlets,
wall outlets, anesthesia equipment and respiratory equipment.
Bay Corporation is an active, contributing CGA member. For additional
information on the Diameter-Index Safety System, please contact
Bay Corporation.
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