System for sealing a space between a tubular opening and a tube

A system for sealing a space between an inner wall of a tubular opening and at least one tube or duct at least partly received in the opening, whose axis is substantially parallel to the axis of the opening, wherein the system comprises at least two segmental longitudinal parts for forming a sealing plug which can be received in the space by sliding movement of the longitudinal parts into the space, wherein the longitudinal parts are each provided with an outside provided with a number of outer ribs spaced apart in a longitudinal direction for realizing, in use, contact surfaces closed upon themselves in a circumferential direction between the sealing plug and the inner wall of the opening, and wherein, further, each of the longitudinal parts is, at a first front end, provided with an outer collar intended to be placed against an outer edge of the opening in use, and wherein, in a free state prior to being received in the space, at least one of the outer ribs substantially has the shape of a sawtooth with a rising surface rising in an outward direction away from the outside of the longitudinal part and in a direction towards the first front end, wherein a first part of the rising surface adjoining the top of the sawtooth is provided with a leveling with respect to a second part of the rising surface located farther from the top, wherein the leveling includes an angle with the longitudinal direction that is greater than zero degrees and less than an angle of the second part with the longitudinal direction, wherein a meeting of the leveling and the part of the rising surface located farther from the top forms an outwardly directed bend located in the rising surface and wherein the sawtooth is provided with a falling surface with a part located relatively far from the top and a part adjoining the top, wherein a meeting of the part located relatively far from the top and the part adjoining the top comprises an inwardly directed bend located in the falling surface, and wherein the bend located in the rising surface is located farther from the outside than the bend located in the falling surface.