Sealing device

The sealing device (1) has a resilient deformable seal element (3) which is inserted into aperture of wall portion. Several sealing cone portions (5,7,19) are coaxial to the seal element and are overlapped with each other. The sealing cone portions are set in reversible releasable connection with the seal element. The sealing cone portion (19) is formed in the inner circumferential surface of the seal element.