Reef Octopus Coral Vue Technology 4" Needlewheel Aquarium Skimmer 100Gal The Reef Octopus Skimmers Are Powered By The Aquatrance 1000 Skimmer Pump. They Are Built With High Quality Acrylic. The Skimmer Has A Gate Valve Which Allows For More Precise Control Of Water Level. The Collection Cup Has A Quick Release Neck For Easy Removal For Cleaning. It Requires 1/2 Inch Of Clearance To Remove The Cup. The Octopus Skimmers Uses Metric Plumbing Parts. The Pump Has An Improved Venturi Design And Pinwheel Impeller