10 cu. ft capacity MC acetylene cylinder, High-quality steel construction with rust-resistant gray paint. Fusible metal safety relief alloy built into the body of the valve. Calcium silicate filler reinforced with alky-resistant glass fiber, asbestos-free. 5.25" D x 18" H. Note: Due to differences between manufacturers, cylinder height may vary by +/- several inches. UN/ISO Stamped, DOT and TC Approved. High-quality 20 cu ft steel oxygen cylinder. Heavy-duty construction with thick walls and durable painted finish. The tank has great low-temperature delivery. Guaranteed date of manufacture or hydro test within 180 days. DOT, ISO/UN, and TC approved. Doctor's prescription required to fill with medical oxygen. Seek the advice of a physician if you have questions about the proper use of medical oxygen. 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. Please note: Acetylene cylinders require a shell inspection every 10 years. They also require an initial porous filler inspection at 5-20 years from the date of the manufacturer. This test is to be done no sooner than 5 years and no later than 20 years from the date of manufacturer. The Shell inspection is marked with an 'S' and the Porous Fill inspection is marked with an 'F'.