This door seal mounts in the channel around the cab door opening, forming a weather barrier between the door frame and the cab body. It compresses against the door panel when closed, reducing dust ingress, water leaks, and cabin noise. Over time, the rubber profile can lose its compliance, leading to gaps that allow dirt and moisture to enter the cab. The seal is molded to match the original profile, which ensures it seats correctly in the retainer channel without adhesive or modification. On replacement, clean the channel of old seal fragments and press the new seal fully into the groove before closing the door to verify uniform contact.