This rubber cover mounts on the threshing unit to shield the drum or concave area from crop wrap and debris ingress. It sits at the interface between the rotating threshing elements and the stationary housing, preventing material from packing into gaps that could cause imbalance or belt slip. A torn or missing cover allows straw and chaff to accumulate, which can lead to vibration and reduced threshing efficiency. The cover is formed to match the original contour of the housing so it seals against the adjacent sheet metal without additional fasteners. On replacement, ensure the cover is fully seated along its mounting edge before securing the retaining hardware.