A device intended to create a direct connection between a breathing circuit breathing tube and an endotracheal (ET) tube, anaesthesia face mask, or other non-sampling breathing circuit component. It is constructed with specific connecting dimensions and may be designed to connect breathing tubes from paediatric to adult sizes. It is typically made of plastic materials and can have a straight or elbow-shaped design (excludes Y-piece connectors). Some designs may allow for partial rotation at the point of connection (a swivel) and may include a suction port or gas sampling port. This is a single-use device.