Why is it important to verify the cylinder design code specification markings on the cylinder before filling?

• A. To verify that it is a propane cylinder
• B. To check the color
• C. To confirm the manufacturer name
• D. To check the fill weight

Answer: (A)

The essential idea is safety through proper identification. Cylinder design code specification markings prove that this container is approved for propane and show the pressure rating and testing status it was built to meet. These markings confirm the cylinder is the correct type for LP gas and that it has been inspected and requalified as required. Filling a cylinder not rated for propane—or one that has failed a required hydrostatic test—can lead to dangerous overpressure or structural failure. Coloring, manufacturer name, or aiming to verify fill weight alone don’t guarantee compatibility or safety the way the official design markings do. So, checking those markings before filling ensures you’re using the right cylinder for propane and that it’s safe to fill.