Extruded sealing member

Claim 1

A ONE-PIECE ELONGATED EXTRUSION ADAPTED TO PROVIDE A SEAL BETWEEN A WALL MEMBER HAVING AN OPENING AND A CLOSURE MEMBER FOR THAT OPENING, THE SAID EXTRUSION COMPRISING INTEGRAL LONGITUDINALLY EXTENDING PORTIONS FORMED RESPECTIVELY OF MATERIALS EXHIBITING DIFFERENT STIFFNESS FOR SAMPLES THEREOF OF LIKE DIMENSIONS, THE EXTRUSION PORTION OF GREATER STIFFNESS COMPRISING AN ATTACHING PORTION ADAPTED TO BE ATTACHED TO ONE OF THE TWO MEMBERS AND THE PORTION OF LESSER STIFFNESS INCLUDING A HOLLOW CHAMBER A WALL OF WHICH PROVIDES A SEALING SURFACE, AND AT LEAST ONE FLEXIBLE WALL INTERMEDIATE SAID ATTACHING PORTION AND HOLLOW CHAMBER SUPPORTING THE LATTER IN SPACED RELATIONSHIP TO THE ATTACHING PORTION AND IN A MANNER PERMITTING MOVEMENT OF THE HOLLOW CHAMBER RELATIVE TO THE ATTACHING PORTION, THE SAID EXTRUSION BEING FORMED ENTIRELY OF SYNTHETIC PLASTIC CAPABLE OF HAVING ITS STIFFNESS REDUCED BY THE ADDITION THERETO OF A PLASTICIZER, THE PORTION OF THE EXTRUSION OF LESSER STIFFNESS HAVING A GREATER PROPORTION OF PLASTICIZER INCORPORATED THEREIN THAN THE PORTION OF GREATER STIFFNESS.