To ensure safety, nitrox cylinders must be:

Nitrox cylinders must be clearly labeled to ensure safety. This labeling is crucial because it allows divers and other personnel to quickly identify the contents of the cylinder, which is essential for preventing accidental misuse or confusion with other types of breathing gases, such as standard air or pure oxygen. The correct labeling also includes important information such as the oxygen percentage in the gas mixture, which influences the planning and execution of dives. Recognizing the specific gas mixture helps divers appropriately manage their exposure to oxygen and avoid potential risks associated with higher oxygen concentrations, such as oxygen toxicity.

While color-coding and cylinder materials may be helpful in identifying gas types, clear labeling is the most critical safety measure to ensure that everyone involved in the diving operation is aware of what is contained in the cylinder.