This invention relates to a viscous medium feeder, which has an inlet, an outlet, a tubular portion, a routable cylindrical shaft arranged in and extending coaxial with said tubular portion, and a drive motor connected to the shaft. The tubular portion has an internal thread, which is connected, at one end thereof, to the inlet, and, at the other end thereof, to the outlet. Further, the tubular portion is elastic, and the shaft abuts inner wall portions of the tubular portion. The invention also relates to a feeder tube, and a jetting device.