What should always be checked before using a gas cylinder?

Before using a gas cylinder, checking the cylinder's label and integrity is crucial because it provides essential information regarding the contents, handling instructions, and any safety precautions that must be observed. The label typically indicates the type of gas contained within the cylinder, which is vital for proper usage and ensures safe handling to prevent hazardous situations.

Additionally, the integrity of the cylinder is fundamental to ensure that there are no leaks or structural weaknesses that could lead to a dangerous situation. A cylinder that is compromised in its integrity poses risks of leaks, explosions, or other hazardous incidents.

While knowing whether it's a new cylinder, the color of the cylinder, or checking for dents can also be beneficial, none of these factors are as critical as the label and overall integrity of the cylinder when preparing for safe use. Understanding the specific gas and ensuring that the cylinder is in good condition are paramount to ensuring safety during its use.