Reef octopus pinwheel/needle wheel skimmers provide you with a high performance features in an easy to use package. Better foam production is provided by hailea otp pumps. New pinwheel impellers provide up to 100% improved performance. 4 inch cone-neck eases transition from bubbles into collection cup. Easy cleaning is provided by quick-release neck. Gate valve allows for easier water level adjustments. Designed for in sump use only.