What is the specific marking required on a scuba cylinder used for enriched air nitrox?

The correct marking for a scuba cylinder filled with enriched air nitrox is a green and yellow band around the shoulder of the cylinder. This marking is essential for ensuring that divers can easily identify the gas type, which is critical for safe diving practices. Nitrox is a mixture of oxygen and nitrogen, and the specific marking helps to prevent accidental use of the wrong gas, reducing the risk of oxygen toxicity and other related hazards associated with diving.

The green and yellow colors are standardized in many dive communities, providing a visual warning to the diver and anyone handling the cylinder that it contains enriched air. This is particularly important in environments where multiple gas mixtures might be in use.

Other choices, such as a red and blue band or a yellow band only, do not represent the standard marking for nitrox and could lead to confusion among divers. Additionally, a green label with the diver's name lacks the necessary color-coding system meant for quick and clear identification of the gas mixture, which is critical for safety during dives. Proper markings ultimately help ensure that divers make informed decisions regarding gas usage underwater.