Coupling device (12) for connecting elongated hollow bodies (26, 28) in an assembly system (10), comprising: a first receiving opening (32) for receiving a first elongated hollow body (26) and a second receiving opening (34) for receiving a second elongated hollow body (28), wherein the receiving openings (32, 34) are arranged relative to one another in such a way that the first and second elongated hollow bodies (26, 28) can be coupled to one another after introduction into the respective receiving openings (32, 34).