Reef Octopus Aquatrance Skimmer Pump w/ Pinwheel Impeller \nCost-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. \nReplacement pump for the following Reef Octopus skimmer models:CLCS-150INT (NWB150), CLSC-150EXT (DNWB150), CLSC-2000HOB, CLSC-150SSS (NWB-150SSS), SRO-2000INT, DCS-150INT, Diablo XS160/Extreme \n*CLSC-150int, SRO-2000int and DCS-150int no additional adapter required.