An external door rubber seal, often made from durable materials such as EPDM (Ethylene Propylene Diene Monomer), is designed to fill the gaps between a door and its frame. These seals come in various shapes and sizes, including flat, tubular, and V-shaped profiles, to accommodate different door types and installations. Their primary purpose is to create a barrier that prevents the infiltration of air, water, dust, and pests while enhancing overall thermal efficiency.