The Motor Protection Plug 86263233 safeguards the HC25 Hydraulic Rock Drill’s motor by sealing access holes in the motor housing, preventing dust intrusion that can cause bearing failure. Generic plugs are often made from brittle plastic or thin metal, breaking easily under impact. This OEM plug is crafted from ductile cast iron that absorbs impact without breaking, ensuring long-term protection. Its precise fit with motor housing holes eliminates gaps, and it requires replacement only if damaged or loosened by vibration.