Strong movement of the water surface is generated by the Eheim wide-jet pipe, which liberally flushes oxygen into the water and imitates the natural movement of water. The wide-jet pipe with ist specially shaped outlet opening spouts the water cleaned by the filter in a wide jet onto the surface. This creates the desired movement. Thanks to ist curved shape, it can be hung over the edge of the aquarium or mounted directly over the surface of the water at the correct angle with the aid of a suction holder.The Eheim wide jet pipe is available in two sizes, for hose 9/12 mm, 12/16 mm and 16/22 mm diameter.