The Pro-Clean Gravel Washer and Siphon Kit effectively separates and removes debris from your aquarium gravel while you perform routine water changes. Constructed with flexible, high quality tubing and a unique gravel tube that will not crack or chip. Each unit comes complete with a 72" length of Pythons high quality tubing made of medical grade non-toxic, ozone-safe, FDA approved material. (Note: to properly ship the XL size the green cap may be removed from tube. Simply push back on to use)