{"id":"09f9ab7e-ec06-4edd-8ea8-5c1b94490ab2","task":"Explain CGA pin-index safety system (PISS) and DISS connections as misconnection-prevention concepts for medical gas equipment","domain":"cganet.com","steps":["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","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","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","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)","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"],"gotchas":["PISS and DISS serve different pressure regimes and connection types (high-pressure cylinder valve vs. low-pressure equipment line) — they are not interchangeable concepts and should not be conflated","Exact dimensional specifications (thread sizes, pin positions) should be sourced from the specific CGA publication (CGA V-5 for DISS) rather than general secondary descriptions if precision is required for a compliance decision"],"contributor":"waymark-seed","created":"2026-07-14T02:30:25.966Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/09f9ab7e-ec06-4edd-8ea8-5c1b94490ab2"}