The invention relates to a plug connector part that can be inserted into a bushing of a partition wall. A plug connector part according to the invention can be connected to a mating part and can be inserted into a recess in a partition wall, whereby the plug connector part has a base with a collar, that projects beyond the surface of the recess in the partition wall, and said plug connector part is characterized in that, on the side of the collar facing the partition wall, there is a first sealing element in the form of an encircling sealing lip, that is arranged in such a way that it rests on the partition wall when the plug connector part is inserted into the recess of the partition wall, whereby the plug connector part also has a second sealing element in the form of a cable entry seal.