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When a cylinder is re-qualified using the external visual inspection method, the letter code that is added to the date stamp is "E." This designation indicates that the cylinder has undergone a specific type of inspection to ensure its safety and reliability for continued use.

Non-destructive methods, such as external visual inspections, are crucial in maintaining the integrity of pressurized cylinders. The addition of the "E" code serves as a clear marker for both users and inspectors that the cylinder has met the necessary criteria for safety and functionality after its inspection. This helps ensure regulatory compliance and promotes the practice of safe handling and storage of cylinders in various applications.

Other codes, like "S," "N," and "T," denote different re-qualification methods or statuses but do not relate specifically to the external visual inspection method. Thus, the presence of the "E" code distinctly identifies the cylinder's compliance with this particular inspection procedure.