The compact Reef Octopus Classic 1000-HOB is a proverbial favorite among hang-on back protein skimmer users providing beneficial filtration for aquariums up to 105 gallons. With its unique design, the pump is mounted externally and under the actual skimmer body allowing for much less room needed behind the aquarium and less heat-to-water exchange. The Reef Octopus Classic 1000-HOB is constructed of high-quality acrylic and equipped with the new highly efficient Aquatrance pinwheel pump that produces an ideal mix of water and air for optimal waste removal. Rated for Aquariums up to 100 Gallons Footprint: 8" x 3.5" | Height: 17" Powered by: Aquatrance 1000 Pinwheel Pump Features - Low Profile body - Low Heat - Pump Mounted Externally - Surface Skimmer - Air Silencer - Solid Construction Filtration Handling - 100 gallon – Light Filtration Demand - 75 gallon – Medium Filtration Demand - 55 gallon – Heavy Filtration Demand Technical Specs - Footprint: 8" x 3.5" - Total Height: 17" Aquatrance 1000s Pinwheel Pump - Wattage: 9w - Air Draw: 420 lph / 15 SCFH* - Water Draw: 350 lph / 92 GPH* *Air and water results will vary depending on aquarium setup Warranty -2 year manufacturer’s warranty on pump and 1 year on skimmer body