What does the "240" in the marking "4BW-240" specifically refer to?

The marking "4BW-240" indicates the maximum working pressure of the cylinder, which is a crucial safety parameter for any gas container. The specific number "240" denotes that the cylinder is rated for a maximum pressure of 240 psi (pounds per square inch). This rating helps ensure that the cylinder can safely contain the gas at the specified pressure without risk of rupture or failure during operation.

Understanding the maximum working pressure is vital for users to select appropriate equipment and ensure safe handling and storage practices. The other options do not represent the marking's purpose: it does not indicate the manufacturing date, weight of the cylinder, or type of gas contained, but specifically refers to the pressure rating, which is essential for safety in the use of LP gas cylinders.