The implantation instrument comprises a first support ring, and a second support ring connected to said first support ring to form a coiled configuration.

The key members are inserted between the support ring and the carrier ring in the direction tangential to the outer periphery of the carrier ring and position the bearing pads and the support ring in the radial direction.

The outer ring (26) is mounted only once the first sealing ring (14) has been moved over the supporting ring (22) and has been stripped.

A flexible outer ring (26) is locked on top of an inner injection-molded supporting ring (22).

The carrier ring (1), the three-part switching ring (2) and the star-point ring (3) have the same longitudinal axis.

Column load is isolated between the open end and the carry ring by supporting the shaped metal vessel by the carry ring.

The support ring is reduced in weight by about 10% to about 70% from a conventional preform support ring.

The support ring is placed on the support ring seat to prevent the removal and idle rotation of the cap.

A support ring and O-ring may also be disposed within the second member.

One end of the support ring tightly presses on the inner end of the elastic ring.

Rods (27) extend between the expansion ring (26) and a support ring (24) that is welded to the column shell (16) to transfer a portion of the load carried by the expansion ring (26) to the support ring (24).

The two ends of the support ring respectively press on the inner end of the elastic ring and the inner end of the sealing ring.

The mixer body forms a support ring (26).

The support ring is in a overlapping complimentary position with respect to the seal element, the seal element having greater elasticity than the support ring and the support ring having a greater load bearing strength than the seal element.

The sealing structure comprises a sealing ring (4), a support ring (5), and an elastic ring (6) sleeved over the outside of a pipe (3).