When moving gas cylinders, what safety feature should always be in place?

When moving gas cylinders, having valve protection caps in place is essential for ensuring safety. These caps serve as a crucial protective measure, as they safeguard the valve from accidental damage during transit. A damaged valve could lead to dangerous leaks, which may result in hazardous situations including fires or explosions. By using valve protection caps, the integrity of the cylinder is maintained, minimizing the risk of unintended gas release.

The other options, while related to safety, do not specifically relate to the act of moving gas cylinders. For example, safety gloves might be useful for carrying out some tasks but do not directly protect the cylinders themselves. Pressure gauges are critical for monitoring the contents and pressure levels within the cylinders but are not a physical protection feature for the cylinder valves during movement. Extension cords are unrelated to the safe handling of gas cylinders at all. Therefore, the use of valve protection caps is the most pertinent safety feature when it comes to moving gas cylinders.