Shock absorber

The invention relates to a shock absorber with a housing (1), an inner tube (2) arranged in the housing (1), a piston rod (6) immersed in the inner tube, a piston (5) arranged at the end of the piston rod (6) immersed in the inner tube (2), which divides the interior of the inner tube into a lower chamber (3) and an upper chamber (4), a first valve arrangement (9) arranged on the piston (5), by means of which a working medium received in the inner tube (2) can flow from the lower chamber (3) into the upper chamber (4) and vice versa during the movement of the piston (5) in the inner tube (2), a second valve arrangement (8) arranged at the upper end of the inner tube (2), by means of which the working medium received in the inner tube (2) can flow from the upper chamber (4) only into the interior of the housing (1) serving as a tank for the working medium during the movement of the piston (5) in the inner tube (2), a third valve arrangement (7) arranged at the lower end of the inner tube (2), by means of which the working medium received in the interior of the housing (1) serving as a tank can flow from the interior of the housing (1) serving as a tank only into the lower chamber (3) during the movement of the piston (5) in the inner tube (2). The shock absorber is characterized in that a first connection element (13) is provided on the lower chamber (3) of the inner tube (2) and a second connection element (12) is provided on the upper chamber (4) of the inner tube (2) for connecting a device for controlling the flow resistance of the working medium in the first valve arrangement (9), and in that a riser tube (14) is arranged at the upper end of the inner tube (2), which extends into the working medium received in the housing (1) and by means of which working medium can be transferred from the housing (1) serving as a tank into the upper chamber (4) of the inner tube (2).