An instrument panel assembly for a motor vehicle includes a panel member, a first conduit, a second conduit and a gasket disposed between the first and second conduit. The panel member has a vent for directing air toward a window in the vehicle. The first conduit has a first end that provides air to the vent and a second end with a peripheral wall forming an inlet. The second conduit has an outlet that provides air to the inlet and a flange that extends outwardly from the outlet and includes a support surface that supports a gasket for sealing an interface between the outlet and the inlet. The second conduit has a lip that extends outwardly from the support surface of the flange and supports the gasket to prevent deformation of the gasket during assembly of the first conduit and second conduit.