a housing with a receiving space for receiving a free end of a pipe section, the receiving space having a first annular stop surface formed by a first radially inward step and a second annular stop surface formed by a second radially inward step;

fixing members arranged in the receiving space for releasably fixing the pipe section in the housing; and

a sealing sleeve arranged in the receiving space and configured to surround an outer circumference of the free end of the pipe section received in the receiving space and thereby seal the interface between the housing and the pipe section in a fluid-tight manner, the sealing sleeve having a first free end and a second free end, wherein the first free end has a bulge with a circular cross-sectional shape defining a diameter, wherein a tubular section protrudes from the bulge and forms the second free end on an edge side,

wherein the diameter of the bulge is greater than a wall thickness of the tubular section in a region immediately adjacent to the bulge, and

wherein, in the installed state of the sealing sleeve before installing the free end of the pipe section:

wherein, in the installed state of the free end of the pipe section, the bulge abuts the second annular stop surface and the free end of the pipe section is received in the receiving space abutting the first annular stop surface, such that the free end of the pipe section and the edge side of the tubular section are located at the same axial position with respect to a longitudinal axis of the housing.