Press-fitting for non removable tube coupling

A press fitting for producing a nondetachable tight connection of smooth-ended pipes, consisting essentially of:

• a toroidal sealing element;
• at least one portion receiving the toroidal sealing element;
• and
• an adjoining cylindrical area extending in a longitudinal direction, and having a shoulder formed as a stop for a pipe which can be pushed in, the sealing element having, in a circumferential direction, at least one portion with a cross section that diverges from a starting cross section of the sealing element so that a substantially axially projecting bulge extends along the circumference and along the cross-sectional plane, and a recess facing the pushed in pipe extends radially in the cross section of the sealing element, the bulge having a volume compared with the starting cross section of the sealing element that is at least equal to a volume of the recess in the starting cross section of the sealing element and, the recess of the sealing element being configured to form a through-opening in the axial direction viewed in cross section of the sealing element in an unstressed state.