It is expensive and time consuming to have your regulator cleaned for use with nitrox. Once normal air is mistakenly used with your regulator, you must, for safety reasons, have it cleaned and serviced. Don't let this happen to your nitrox dedicated equipment! Using this clearly-labeled nitrox only hose protector on all of your hoses used exclusively for nitrox diving prevents costly mistakes. This hose protector is made of tough vinyl, and is ribbed for proper water drainage.