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…or leakage. If the test date, identification, markings, or cap are not in order, if the cap is rusted or inoperable, or if the cylinder is damaged it shall be taken out of service and returned to the manufacturer for repair or disposal. Labeling All compressed gases received, used, or stored must be labeled according to the United States Department of…
https://www.wichita.edu/services/environmental_health_and_safety/Safety/compressed_gas_safety.php