ISO 21969:2009 applies to high-pressure flexible connections intended to be connected to cylinders or cylinder bundles with nominal filling pressures up to 25 000 kPa at 15 °C for use with the following medical gases:

• oxygen;
• nitrous oxide;
• air for breathing;
• helium;
• carbon dioxide;
• xenon;
• mixtures of the gases listed above;
• air for driving surgical tools;
• nitrogen for driving surgical tools;
• oxygen-enriched air.

ISO 21969:2009 applies to high-pressure flexible connections intended to connect cylinders or cylinder bundles to manifolds within sources of supply of medical gas pipeline systems complying with ISO 7396-1.

ISO 21969:2009 applies to high-pressure flexible connections intended to connect a cylinder to an inlet port of medical equipment (e.g. anaesthetic workstation or lung ventilator) fitted with an integral pressure regulator complying with ISO 10524-1.