Abstract: An element for adjusting the width of the outlet (11) in paper towel dispensers (10) consists of a single piece molded in a plastic material having resilience features, in two specular left (1a) and right (1b) versions, which is substantially C-shaped with two lugs extending from a central body. Said lugs are parallel and spaced by a distance substantially equal to the thickness of the bottom wall (12) of the dispenser (10) in the area where the outlet (11) is formed, so as to enclose said area between a first lug of smaller extension on the outer side and a second lug of greater extension on the inner side. The inner lug carries a securing member suitable to couple with any of a plurality of mating fixing members provided close to the outlet (11) of the dispenser (10), so as to reduce by an adjustable extent the free width of the outlet.