Rubber panel grommet 2561 is a pass-through component used to line openings in aircraft panels and bulkheads. Its primary function is to protect wires, cables, or tubing passing through a cutout by separating them from the sharp edges of the panel. The grommet helps maintain clearance and support for routed conductors in avionics bays, instrument panels, and other interior structures where harnesses or lines pass through sheet metal or composite walls.