The Reef OctopusÂ® skimmers are powered by the Hailea OTP pumps. 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. We developed a new pinwheel impeller that is being provided on all of the NWB skimmers as of June 1. Below are the test results from the old impeller to the new improved impeller.