A device that is a component of a medical gas pipeline system or a medical gas/vacuum pipeline system that has a gas-specific outlet connection for medical air. It is designed to be mounted to wall-mounted medical supply units, utility supply systems (ceiling pendants), or directly to a wall, and functions as the outlet assembly of a gas pipeline system to which the operator can connect and disconnect a device, typically anaesthesia systems, ventilators, respiratory devices and devices that are powered using this gas type. On disconnection of the medical device from the outlet, it will self seal the gas pipeline system preventing gas leakage to the environment.