This door-window gasket seals the gap between the cab door frame and the glass, preventing water, dust, and noise from entering the operator station. It is installed along the perimeter of the door window opening and compresses against the glass when the door is closed. A degraded or hardened gasket allows air and moisture ingress, which can lead to interior corrosion and reduced cab pressurization. The original-manufacturer profile matches the door frame's retention channel, so the gasket seats without adhesive or additional fasteners.