Explain CGA pin-index safety system (PISS) and DISS connections as misconnection-prevention concepts for medical gas equipment

Steps

1. Confirm the Pin-Index Safety System (PISS) is used for high-pressure cylinder valve-to-yoke connections (e.g., small cylinders on anesthesia machines, portable oxygen equipment), using a gas-specific arrangement of pins (on the yoke/regulator) and matching holes (on the cylinder valve) so only the correct gas cylinder can physically connect to a given yoke
2. Confirm the Diameter Index Safety System (DISS), standardized via CGA V-5 (Diameter Index Safety System — Noninterchangeable Low Pressure Connections for Medical Gas Applications), defines non-interchangeable threaded connections for medical gas applications at pressures at or below 200 psig, using gas-specific concentric bore/shoulder dimensions so mismatched gas connections cannot physically mate
3. Confirm both systems exist specifically to prevent misconnection between different medical gases at the equipment interface level (cylinder-to-regulator for PISS; low-pressure line/equipment connections for DISS), complementing NFPA 99's piping-level cross-connection testing and labeling requirements
4. Confirm PISS and DISS are distinct from the quick-connect station-outlet fittings used at wall/ceiling outlets (which have their own gas-specific, non-interchangeable design, often proprietary per manufacturer but standardized in function)
5. Confirm which specific CGA publication (e.g., CGA V-5 for DISS) governs the connection type relevant to the equipment in question before citing exact dimensional specifications