Abstract: In a plug-in connection (1), in particular for fluid lines, which comprises a part of the connection (2) to be inserted and a receiving part of the connection (3), between which a seal (10) can be clamped and which are able to be releasably connected to one another by flexible snap-in elements (7, 18) in a snap-in position, the seal (10) can, be clamped between a front portion (4) of the part of the connection (2) to be inserted and an abutment (11) in the receiving part of the connection (3) and the distance of the snap-in elements (7) of the part of the connection (2) to be inserted from the front portion (4) of the latter is dimensioned such that the snap-in position is reached after slight axial compression, and if need be radial compression, of the flexible seal (10).