Aquatop PF15-UV Hang-On Filter with UV Sterilization 64 gallons per hour flow rate Suitable for aquariums up to 15 gallons 3.5 watt pumping power 5 Watt UV Bulb Independent UV light power switch. 64-Gallon per hour flow rate Suitable for aquariums up to 15-gallon 3-1/2 watt pumping power 5-Watt UV Bulb Product Dimensions: 5-inch by 5-1/2-inch by 7-inch