Reef octopus aqua trance skimmer pump w/ pinwheel impeller. Cost effective octopus protein skimmer pumps provide exceptional performance at an economical price. Direct replacement pumps for newer reef octopus classic protein skimmers modified with large grey threaded outputs. Available in 2 sizes. Replacement pump for the following newer skimmer models with large grey threaded outputs: NWB 110, dnwb110, bh-1000, bh-100, bh-100f, bh-100ss, bh-300.