be actuated by compressed or pressurized air bellows 20 or equivalent actuators as best seen by referring to fig1 both of the dewatering cylinders 13 and 14 are of known construction and provided with an open outer surface that is to say their not particularly referenced cylindrical outer surfaces or jackets are equipped for instance with bores or continuous slots the first dewatering cylinder 13 is provided with support walls 21 which enable lateral outflow of the expressed or squeezed out water and water entering from the outside into the interior of the dewatering cylinder 13 as the case may be the same purpose is also fulfilled by the openings 22 of the dewatering cylinder 14 which extend in the axial direction of such dewatering cylinder as will be further recognized by referring to fig1 both of the dewatering cylinders 13 and 14 are arranged with their lengthwise axes located in essentially the same horizontal plane e additionally it will be seen that the diameter d 2 of the second dewatering cylinder 14 is smaller than the diameter d 1 of the first dewatering cylinder 13 the first press roll 15 is located beneath the plane e at a spacing which is greater than its roll radius r both of the wires 1 and 2 travel between the second dewatering cylinder 14 and the first press roll 15 in an essentially vertical downward direction as shown in fig1 the second press roll 16 is located at the side of the first press roll 15 which faces away from the second dewatering cylinder 14 the line shaped press location or pressure nip p between both.