A cylinder has "DOT 3AA 2015" stamped on it. What does the 3AA stand for?
a. Ownership mark c. Non–heat-treated carbon-steel
b. Manufacturer's mark d. Heat-treated, high-strength steel
ANS: D
3AA stands for heat-treated, high-strength steel. Type 3A cylinders are made of carbon-steel (non–heat-treated).
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