Abstract: The invention describes a device (1) for the production of film tubes (3) comprising: a die head (5) comprising an annular nozzle (4), from which plastic melt for producing the film tube (3) can be extruded in a transport direction (y), at least one fluid-application device, which is annular in shape at least in certain regions and which follows the die head (5) in the transport direction (y) and which surrounds the film tube (3) annularly and by means of which a fluid can be guided toward the film tube, at least one ring (20), the diameter of which is larger than the annular region of the fluid-application device. An adjusting device (21) is provided, by means of which the ring (20) can be adjusted in height relative to the fluid-application device.