Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 11 Containers for compressed or liquefied gas, of iron or steel 73 11 00 Of a capacity of 30 l or more, but less than 110 l, for Automotive Compressed Natural 73 11 00 21 Of a capacity of 30 l or more, but less than 110 l, for Automotive Compressed Natural Commodity Code Description 73 11 00 21 00 Of a capacity of 30 l or more, but less than 110 l, for Automotive Compressed Natural