Classic Series Protein Skimmers As one of the Reef Octopus Classic Series skimmers, this NWB-150 will provide great performance for well stocked aquariums up to 150 gallons. It is constructed from high quality cast acrylic, o-ring sealed union pump mount, bubble diffuser top not craftsmanship powered by the Hailea OTP pumps. The skimmer bodies 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. All Reef Octopus skimmers uses high grade metric plumbing parts. - Bubble Diffusing Chamber and Hybrid Cone Body that naturally reduces and stabilizes the foam production; This means less turbulence in the neck area and more contact time for organics to rise and collect - Oversized Air Silencer for quiet operation and airline mount - Collection Cup with flow directional guide, drain and unit venting - Precision Control with the easy to turn output flow valve - Power The OTP 2000 pinwheel pump offers super efficiency and the very best in performance.