Check the listing for details. Python Pro Clean Aquarium Vacuum Gravel Washer (Pick a Size) Free Shipping. Condition: New. Listed at 11.99 USD. 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) SizesMini : 1" diameter x 6" long For aquariums up to 10 gallons in size Small: 1" diameter x 12" long For aquariums from 10 to 20 gallons in size Medium: 2" diameter x 10" long For aquariums up to 20 gallons in size X-Large: 2" diameter x 24" long For aquariums over 55 gallons in size.