High-quality 80 cu ft steel oxygen cylinder. Includes steel cap. Heavy-duty construction with thick walls and a durable painted finish. The tank has great low-temperature delivery. Guaranteed date of manufacture or hydro test within 12 months. DOT approved. Please be sure to use a regulator that fits the cylinder valve, and that is correct for your application of use. Product note: compressed gas cylinders can be dangerous if used improperly. Please be careful, know the correct procedures for use, and exercise caution when connecting and using any compressed gas device. All cylinders ship empty. Please consult your local compressed gas supplier for filling needs. Cylinder color green varies in shade.