Abstract: An improved device for periodic cleaning of large diameter, cylindrical pipelines to remove from their inside wall marine growths or other deposits that implede liquid flow has a central shaft from which struts extend to carry wheels that run along the inside wall of the pipeline is disclosed. Rotor blades are carried on the front end of the shaft and function to drive cutter blades or crusher rollers over the inside wall of the pipeline to remove the impeding deposits. The device moves through the pipeline while water flows therein under control of a line fastened to the rear end of the shaft.