The invention relates to a device for filling air tires, particularly bicycle tires, with a tire sealing fluid through the valves of the tires, wherein the device is configured as an adapter set (1) having a connector (3) for the tire fluid, and having multiple individual parts (10) which can be inserted into one another, and onto the valves by means of inserting, clipping, and/or screwing, which can be varied with respect to one another depending on the valve type, such as Dunlop valves, quick valves (8), or Sclaverand valves (9).