Where is the identification information found on a DOT Cylinder?

The identification information on a DOT (Department of Transportation) cylinder is permanently stamped into the container collar. This stamping provides essential details about the cylinder, including its specifications, type, and testing information. This permanence ensures that the information is durable and resistant to wear, making it easily accessible for safety inspections and regulatory compliance.

The other choices may include associated information, but the identification details are mandated to be permanently marked on the collar for clarity and assurance of safety standards in handling compressed gases. The data plate, cylinder label, and valve may provide additional safety instructions or contents information but are not the primary source for identification information as stipulated by DOT regulations.