The Hydra Pools H02919 is an Aquagenie Tygon Tube 12" 3/8 Odx .25" Id. Because of its revolutionary design, the Aqua Genie removes surface debris up to ten times faster than conventional skimmers. At the same time, it continuously feeds a precise amount of chlorine into the pool, assuring clean, healthy water without over-chlorinating. In short, the Aqua Genie is an entire pool-maintenance system, dramatically reducing the time you'd normally spend chlorinating and vacuuming your pool.