Reef Octopus® BH100 Hang-On-Back skimmer Dimensions: 8" x 3.25" x 17" Rated up to 75 gallons Powered by 1 OTP 1000 pump at 250 gph Wattage: 13w Air draw: 180L/H (6-7SCFH) High performance venturi air injection system Pinwheel Impeller 1 year warranty on skimmer body and pump - Description: Our BH-100 is our entry level HOB skimmer design. The pump is mounted externally within the aquarium. This is a simple user friendly HOB skimmer ideal to skim small aquariums up to a 75 gallons. Simply place the skimmer on the back of the aquarium, mount the pump in place as the instructions list and it is ready to skim. The Reef Octopus skimmers are powered by the Hailea OTP pumps. They are built with high quality acrylic. The Octopus skimmers uses metric plumbing parts. The pump has an improved venturi design and pinwheel impeller. We developed a new pinwheel impeller that is being provided on all of the BH100 skimmers.