This bellows assembly seals the lower section of the seed-metering unit on a grain seeder. It protects the moving internal components from dust, soil, and moisture ingress during operation. A torn or collapsed bellows allows foreign material into the metering mechanism, leading to irregular seed flow and potential jamming. The original part matches the mounting flange geometry and compression range of the housing it seals, so the dust boot maintains its protective position throughout the full stroke of the linkage.