Abstract: A peeler uses parallel inclined valleys in a cylindrical interior surface to serve as channels. The parallel valleys are between parallel ridges or ribs. A rotary disk having a series of bumps and an abrasive surface is rotated so as to abrasively remove an outer portion of agricultural products. The debris corresponding to removed portions is urged downwardly and out a peripheral debris exit by the ridges as rotation takes place. A wear rim around the disk has an upper surface and the debris exit is between the wear rim and the interior surface. The interior surface is on a liner having a lower surface. The upper surface of the wear rim is no greater than 1/4 inch higher than a lower edge of the liner such that a restricted passage therebetween has a height no greater than 1/4 inch. An expansion zone is just below the restricted passage.