Purpose - A colored PTFE spiral tube marker is wound onto the hose. It is possible to do this with the hose already in application if required, and the marker may be removed with equal ease. The advantages of PTFE colored markers are that they have they have excellent chemical resistance, and the non stick PTFE surface ensures that the color remains clean and bright. If required, it can be secured in place on the hose by a transparent heart-shrink polyolefin sleeve, but the PO sleeve cannot be applied to hoses in application.