Abstract: An outlet assembly for a vacuum cleaning system includes a face plate for mounting on the exterior surface of a building wall, an annular inlet bushing or socket open from the face plate and extending through the building wall and a back plate positioned adjacent the interior surface of the building wall and opposite the face plate and with the inlet bushing extending therethrough. The inlet bushing connects to a vacuum conduit from the vacuum cleaning system for flow of air therethrough. A seal fitting member is positioned generally between the building wall and the back plate and sleeved about the inlet bushing. A resilient seal therein engages the outer surface of the inlet bushing in air-tight relationship and a flange portion engages with the open end of the vacuum conduit and secures the vacuum conduit to the inlet bushing.