An energy efficient 1000 GPH laminar water pump, the propeller driven pump creates high water flows with a wide gentle pattern. The water flow can be directed in a range of 160 degrees by rotating the directional discharge. Like all Rio water pumps, the unit has a high quality ceramic shaft and ceramic bearing in the impellers rotor for durability and quiet operation. Strong magnet mounts secure the pump to the wall of the aquarium. Dimensions: 4.2 x 2.1 x 2.6 inches. Magnet will work on glass up to 1/2" thick.