Rhinox Airline Tubing: 6 Feet in Length, Standard fit for All Aquariums air Pump, BPA Free GREAT FOR AQUARIUM AIRLINE USES --- For use on all aquariums, especially with heavy duty professional and commercial air pumps. It has an inner diameter of 3/16" and comes with three suction cups and two check valves that prevent backflow that may damage the air pump and other electronic equipment. FLEXIBLE AND KINK-RESISTANT --- Rhinox Airline Tubing is made with good quality plastic and resistant to kinks. Sturdy yet flexible, it can wrap around any aquarium tank and equipment without snagging or affecting air flow. EVERYTHING YOUR AQUARIUM NEEDS --- At 6-ft in length, you'll have sufficient tubing for most aquarium sizes. CLEAR AND UNOBTRUSIVE --- Clear and discrete, doesn't obstruct the beauty of your aquarium landscape. MULTI-PURPOSE --- Besides aquariums, Rhinox Airline Tubing is great as irrigation pipes in gardens, or even for replacing the milk pipes in espresso machines.