Valve tags are an important way of improving the safety and efficiency in many facilities. A tag is permanently attached to the valve and engraved with a number as a means to quickly identify the valve and its contents. A separate list would detail all the valves and their contents within a facility, allowing maintenance teams to identify the correct system and valve quickly to resolve the issue. Tags can also be used as part of a Lockout Tagout System. When locking out equipment all power sources need to be isolated, and this often includes valves which regulate compressed air, liquids or other contents.