Good water circulation is critical to maintaining a healthy environment. The Rio HyperFlow delivers high performance at an affordable price. This compact, highly efficient pump uses Neopower magnetic vortex rotor blade technology to pump more gallons per watt than any same-size external pump. Rare-earth compounds pack power into a neatly compact pump. Cool and efficient operation keeps energy costs low. The shaft with ceramic bushings offers strength and resistance to corrosion. High-impact plastic construction makes Rio HyperFlow durable and reliable. The Rio HyperFlow is fully submersible and offers the best-performance water pump on the market. Features high flow rates, low heat output and are designed to be energy efficient keeping electric bills low, in addition providing tremendous pressure capabilities. small adapter 25mmDia, Big adapter 33mmDia