Pipe markers are labels that are attached to pipes in order to identify the contents of the pipe and indicate the direction of flow. They may include stock or custom legends and be suitable for with high-temperature pipes, rough or greasy pipes, and pipes with areas of abrasion. Ammonia systems and medical gas distribution systems can be labeled with a pipe marker. Marking pipes helps workers identify pipe contents and understand potential dangers. Marking pipes can also help avoid accidental contamination and eliminate confusion when personnel need to shut down a line.