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Compressed gas cylinders for breathing air are regulated in the United States by:
Correct Answer: D
Breathing Air Cylinder U.S. Department of Transportation (DOT) Regulations Compressed gas cylinders for breathing air are regulated in the United States by the Department of Transportation (DOT). U.S. federal regulations for the construction, testing and maintenance of compressed gas containers are contained in 49 CFR178, Subpart C. These DOT specifications apply to steel SCBA and large storage cylinders only. Cylinders constructed of manganese/steel and conforming to the proceeding DOT specifications designated by DOT3A marking on the cylinder. Steel cylinders constructed of chrome alloy steel and meeting DOT specifications are designated by a DOT3AA marking on the cylinder, followed by the marked cylinder service pressure.