The Plastic Plug 86488475 is designed to protect unused hydraulic ports on HC25 Hydraulic Rock Drills during storage, transportation, or maintenance, preventing dust and water contamination. Generic plastic plugs are often made from brittle low-density polyethylene that breaks easily under minor impact. This OEM plug uses high-strength polypropylene (PP) with impact modifiers, ensuring it withstands rough handling without breaking. Its flexible design allows for easy installation and removal, and it creates a tight seal over unused ports, keeping internal components clean until the ports are ready for use. Replacement is only needed if the plug is lost or broken.