Which is a requirement for all fire extinguisher cylinders according to DOT?

For fire extinguisher cylinders, it is essential that they be subjected to testing and stamped as part of compliance with DOT regulations. This requirement ensures the safety and integrity of the cylinders, confirming that they can withstand the pressures and conditions for which they are designed. The testing process involves various inspections and evaluations, including hydrostatic testing, which checks for leaks and structural integrity. Once tested, the cylinders are stamped with specific markings that indicate they have passed these rigorous standards, including the date of the test and the type of cylinder. This regulation is vital for ensuring that fire extinguishers are reliable and effective when needed.

While aspects like color coding, user manuals, and safety warning labels are important for the operation and identification of fire extinguishers, they do not hold the same regulatory significance as the testing and stamping of the cylinders.