A conduit structure provided with a rotation coupling comprises a first hose part (1) with a first coupling part (4) at an end thereof, and furthermore a second coupling part (5) at an end of a further part (6, 15; 2, 4, 19). The first coupling part can be inserted into the second coupling part and the coupling parts are provided with a separate sealing element (9) as well as with locking means (17, 18), such that the first and the second coupling part are rotatably but non-slidably coupled. The first hose part (1) extends through and some distance beyond the first coupling part (4) and in the coupled condition the sealing element (9) seals the space between the portion of the first hose part that extends beyond the first coupling part and the second coupling part (5).