Abstract: The invention relates to a connecting branch (10) comprising a replaceable insert part (20) which is placed in a chamber (22) in a sealed manner. Said chamber is open in the front and is located inside the connecting branch (10). A ring-shaped sealing surface having a rotating sealing bead (16) is arranged on the insert part (20). The bead can be pressed into a front surface of an axial sealing ring (14) made of a soft metal, said surface being situated opposite the connecting branch, when coupling a connecting nipple (12) to the connecting branch (10). The insert part (20) is advantageously sealed in the chamber (22) by a second axial sealing ring (32) whose sealing surfaces also having sealing beads (34, 36). The insert part (20) can be merely replaced when the sealing bead (16) is corroded or damaged. As a result, a difficult subsequent fashioning of the standard seal bead (16) on the connecting branch (10) is unnecessary.