This cylinder was cleaned for oxygen and oxygen-enriched service at the factory. If you intend to use this cylinder for oxygen or oxygen-enriched service (i.e. with any gas containing oxygen concentrations of 23.5% or more), all components used with the cylinder must be oxygen compatible. It is the responsibility of the cylinder user to ensure that the cylinder and all components are maintained in a proper state of oxygen cleanliness in strict accordance with regulatory requirements and industry standards.

The U.S. Department of Transportation (DOT) has interpreted its regulations within CFR 49 Section 173.302 (page 691 in 2010 edition) stating that DOT-3AL aluminum cylinders cannot be charged with any gas with an oxygen content exceeding 23.5% to a service pressure greater than 3000 psi. Thus, SCUBA cylinders with a service pressure of 3300 psi (Neutral 80's and Aluminum 100's) should never be charged beyond 3000 psi if fill ed with o xygen enriched air.