Dymax Wave Deflector is a rotating deflector that turns your existing power head into a wave maker. This device is designed to fit most power heads, water pumps and even the output from a canister filter. With its unique 360° rotating feature, the deflector internally is made with gears and rotate fans, so that water will flow through it causing a circular movement without any added energy cost. In this way, the Wave Deflector help to improve water circulation, air exchange and most of all to simulate natural ocean conditions in your own reef aquarium with coral and inverterbrates.