An assembly of devices designed to conduct medical gases from an anaesthesia unit/workstation to a patient artificial airway/anaesthesia mask (not included) during general anaesthesia. It includes breathing tubes and a Y-piece connector, typically with a ventilator/ventilation bag and appropriate connectors, and may include a carbon dioxide (CO2) absorber, a one-way directional valve, or adjustable pressure limiting (APL) valve. This is a single-use device.