Perimetric sealing element for a metal shoulder in particular in a molding of an opening of a vehicle body

The extrusion (1), designed to be fitted to the metal edge (7) of a motor vehicle body opening, consists of a generally U-shaped fastening member (2) coextruded with a supple sealing member (3). The fastening member has two branches and is made from two different plastic materials - a rigid or semi-rigid basic component and strips (22, 23) of a material with enhanced friction in the contact zones between its two branches (8, 9) and the metal surround. The two branches are more or less parallel to one another but not straight, having vertical sections (12, 13), second sections (14, 15) angled at 45 degrees to the first, and third sections (16, 17) at 90 degrees to the second ones and angled in the opposite direction.