The breathing oxygen cylinder features include color and band width; the band is how wide?

• A. 1 inch
• B. 3 inch wide white band
• C. 2 inch
• D. 4 inch

Answer: (B)

The important idea here is how oxygen cylinders are identified by color and a broad marking. For breathing oxygen, there’s a white band around the cylinder that is three inches wide. That wide, white band is deliberately large so it’s easy to spot quickly in a cockpit or maintenance area, helping distinguish oxygen from other gases and ensuring the cylinder is handled and inspected correctly. The other widths don’t meet the standard visibility requirement, so they aren’t used.