Specifications Flow: 500-3000 gallons per hour Power Consumption: 9-28 watts Maximum Motor Temperature: 50-60 degrees Celsius Aquarium Wall Thickness Range: 3/16”-3/4” Appropriate Tank Size Range: 20-500+ gallons Dimensions: Wet Side- 3” diameter by 2.25” long, Dry Side- 3” diameter by 2.25” long Clearance Needed Behind Aquarium: 3”