Patent ID: 8919368

Claim:
A self-locking T-piece for connecting an attachment to a breathing gas line, the self-locking T-piece comprising: a line section; a connection line branching off from the line section; a spring; a movable valve body with a valve disk body; and a valve seat, wherein the valve body is prestressed by the spring into a sealing position with the valve body engaging the valve seat, in which the valve body seals the connection line relative to the line section, and the valve body is moved out of the sealing position when connecting the attachment to the connection line, the valve body being elastically deformable, such that the valve body can be advanced through the connection line and through the valve seat while undergoing elastic deformation and the valve body returns to an original shape during entry of the valve disk body into the line section, the original shape of the valve body having a sufficient extension to be able to cover the valve seat for sealing.