A shock absorber having a shock absorber tube (10) is disclosed and has an external module tube (11) which is arranged retentively on the outside of the shock absorber tube (10) by a flange (12), wherein the flange (12) has one or more fluid ducts (13, 14) which fluidically couple the module tube (11) to the shock absorber tube (10). The flange (12) has a plastics body (15) in which the fluid ducts (13, 14) are formed, and the flange (12) furthermore has metallic connecting elements (16, 17) which extend between the shock absorber tube (10) and the module tube (11) and by which the mechanically retentive connection between the shock absorber tube (10) and the module tube (11) is formed.