Powerful and durable, fully adjustable flow diffuser with venturi feature. Can be used alone in the aquarium to agitate water surface and increase gas exchange or by adding a Dive Power Head to an undergravel filter which will improve filtration by moving more water through the gravel, oxygenates the water and improves biological capabilities. Tapered riser adapter fits all undergravel filters. Adjustable hanger bracket (for 85, 125 & 200) Stay-Stick silicon suction cups Epoxy sealed motor Air filter Flow diffuser (except Model: 40) Specifications: Wattage: 24W Flow Rate: 400gph Max Height: 4.4ft Voltage: 115V Amperage: 0.30mA Recommended Aquarium Size: 55++gals Dimensions: 2 3/4" x 5" x 5 5/8"