M122 and MM are two names for the same size of medical oxygen cylinder, and suppliers use them interchangeably, which is why both appear on this page. If a specification or purchase order refers to either code, this is the cylinder meant. Confirm the valve connection as well as the size code when ordering.

Medical oxygen cylinders run through a lettered and numbered range from small portable sizes such as M7 and D up through M22, M60, M90, M122 and larger. M122 is a large size intended for fixed or facility use rather than for carrying. The right size depends on the installation and the filling arrangement, not on the cylinder alone.

No. It ships empty. Medical oxygen is a prescription drug product in the United States, and filling it is done by licensed medical gas fillers operating under the applicable regulatory requirements. All Safe Global supplies the cylinder as a container to the trade; we do not supply medical oxygen gas.

It is sold wholesale to medical gas distributors, licensed fillers, home care providers and healthcare supply organizations. All Safe Global is a wholesale distributor and does not sell single cylinders to patients or members of the public. Contact us for trade pricing and quantity terms.

This cylinder is supplied with a CGA540 valve, as stated on this page. CGA540 is the connection used for larger oxygen cylinders, while smaller medical cylinders commonly use a CGA870 post valve, and the two are not interchangeable. Confirm which your equipment and filling process require before ordering.

A post valve, CGA870, uses a yoke arrangement common on smaller portable medical cylinders. CGA540 is a threaded connection used on larger cylinders. They serve the same gas but are entirely different fittings, so the regulator and the filling connection must match the valve on the cylinder.

Aluminum is lighter for the same capacity and does not rust, which matters in healthcare environments and for handling. It is the common construction for medical oxygen service. The cylinder specification and pressure rating are stamped on the cylinder and listed on this page.

The cylinder is manufactured and marked to United States Department of Transportation and Transport Canada specifications, which is what permits it to be filled and transported in those markets. The specification, serial number and test date are stamped on the cylinder, and a filler reads them before every fill.

On a set DOT interval measured from the test date stamped on the cylinder. A filler checks that date before every fill and will refuse a cylinder that is out of date. All Safe Global is a DOT-authorized requalifier and can requalify cylinders in service.

Yes. We operate DOT-authorized requalification centers offering hydrostatic and ultrasonic testing and visual inspection. Oxygen service requires hydrocarbon-free preparation, and cylinders returning to oxygen service must be handled accordingly. Fleet requalification is quoted per cylinder against volume.