Coupling device

A coupling device for a tube comprising a sleeve part for receiving a part of the tube, and a sealing organ which is arranged to provide a seal around the tube as it is at least partly inserted into the sleeve part, wherein the sealing organ comprises a plurality of elements that form part of a substantially closed ring, and wherein the sealing organ further comprises a rubber ring of which at least a first portion is placed between the tube and the elements and a second portion is placed between the elements and the sleeve part, wherein the elements are provided with cooperating tongue and groove connections which annularly extend near the closed ring's outer circumference and are positioned at the sides of the elements facing the second portion of the rubber ring that lies adjacent to the sleeve part, and that each of the tongues and grooves of the tongue and groove connections are dimensioned with a length in the tangential direction, which amounts to at least one and a half times the width of each of the tongues and grooves of these connections as seen in the radial direction of the coupling looking from a longitudinal axis of the coupling device transversely to the tangential direction.