The Reef Octopus Classic 110INT 4" Internal Protein Skimmer is a highly effective in-sump filtration device designed for saltwater aquariums up to 130 gallons. As a vital component of the Classic Series, this skimmer efficiently removes organic waste and impurities from your aquarium water, significantly contributing to a healthier and more stable aquatic environment for your corals and fish. Its internal placement within the sump ensures a compact and discreet footprint. Constructed from high-quality cast acrylic, the Classic 110INT boasts an array of user-friendly features, including an easy-to-adjust gate valve and a quick-release neck for effortless collection cup removal and cleaning. It incorporates a cup drain, bubble diffuser, O-ring sealed union pump mount, and an air silencer for quiet operation. Powering this unit is the air-shredding Aquatrance 1000s pinwheel pump, drawing 9 watts and processing 420 liters per hour of air, all within a compact 10.4 by 7 inch footprint and 19.75 inch total height. This protein skimmer is an excellent choice for reef hobbyists and saltwater aquarium keepers who maintain systems up to 130 gallons and require reliable, efficient organic waste removal. Its robust build and thoughtfully designed features make it suitable for those seeking to maintain pristine water quality with minimal hassle, particularly for sumps with a recommended water height between 7 and 8 inches. It's a dependable solution for both mixed reef and fish-only setups.