What device connects the oxygen cylinder to the anesthesia machine?

The hangar yoke is the correct choice because it serves as the physical device that secures the oxygen cylinder to the anesthesia machine. It ensures a proper fit and alignment, allowing for a reliable connection between the cylinder and the machine. This connection is vital for delivering oxygen safely and effectively during anesthesia.

The hangar yoke typically features a specific design that accommodates only certain sizes or types of cylinder valves, preventing incorrect cylinder attachment. This physical structure is key in the functioning of the anesthesia machine, ensuring that the oxygen supply is both accessible and correctly interfaced with the device.

Other options, while related to the context, do not serve the primary role of connecting the oxygen cylinder to the anesthesia machine in a direct manner. The high-pressure connection refers to the way gases are handled under pressure, but it is the hangar yoke that specifically facilitates the actual connection. The diameter index safety system, while important for safety to prevent incorrect gas connections, operates on a broader principle of preventing cylinder misconnection rather than establishing physical attachment. The floating check valve is crucial for preventing backflow of gases but does not connect the cylinder to the machine itself.