If you are unfamiliar with the valves, seek competent aid. If you remove the safety nut instead of the outlet cap, for example, you will not be able to stop the flow of gas. Use cylinders with appropriate equipment. Do not force connections or use unauthorized adapters. Never use a cylinder without a regulator.
Close cylinder valves.
Always close the cylinder valve when the cylinder is not in use or when it is empty. Replace dust covers and dust caps. Oxygen cylinders will support the rapid combustion of most materials. Flammable materials contaminated by oxygen, especially materials such as oil, paint or grease, become extremely dangerous. Oxygen intended for use in welding is not breathing oxygen and must not be substituted for air used in ventilation systems.