Abstract: A plug-and-socket connection part for being fastened to a wall includes a contact housing, a guide sleeve extendable through a wall opening, a carrier, and a locking member. The locking member locks the guide sleeve, the contact housing, and the carrier together such that the guide sleeve and the carrier are connected to the contact housing in an axial direction free of play. The guide sleeve and the carrier each include a respective locking stop and the contact housing includes a flange. The locking member includes inner locking sections which are operable with the locking stop of the guide sleeve and the flange to prestress a support arrangement between the guide sleeve and the contact housing. The locking member includes outer locking sections which are operable with the locking stop of the carrier and the flange to prestress a support arrangement between the carrier and the contact housing.