Abstract: An outlet tube comprising a unitary material sheet folding into a rectangular shape and having overlapping ends secured with rivets, the outlet further including flanges extending outwardly from one end of the walls of the rectangular shape, and slots at the upper and lower fold lines to accommodate irregular shaped holes via bending of the sides of the outlet tube. Three sizes of flat blanks handle all gutter common hole sizes, and these blanks are made by one die assembly, which include holes on flange to allow riveting to the floor or the gutter.