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 nitrogen (N2). 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/disconnect a device, e.g., a surgical power tool or a laboratory device. It may incorporate a dual connection where one serves as a return for removal of the exhaust nitrogen. On disconnection of the device from the outlet, it will self seal the gas pipeline system preventing gas leakage to the environment.