Product Description: Durable Expansion Tank Cap for Optimal Cooling System Performance Ensure the efficiency and reliability of your vehicle's cooling system with our Expansion Tank Cap. Designed for durability and enhanced sealing, this cap is essential for maintaining optimal engine performance and preventing coolant leaks. Applicable Model: This expansion tank cap is compatible with various models, including S-Type, Super V8, Vanden Plas, XF, XFR, XJ8, XJR, XK, and XKR. Please confirm compatibility with your specific model to ensure a perfect fit and avoid unnecessary returns. OE Number: Reference part numbers are C2P17700 and XR82823. Ensure these numbers match your original equipment for correct fitment and to avoid purchasing errors. Sturdy Material: Constructed from high-strength materials, this overflow expansion tank cap is sturdy, wear-resistant, and resistant to rust, oxidation, and deformation. It offers excellent reliability and durability, ensuring long-lasting performance. Enhanced Sealing Performance: Replace your damaged cap with this enhanced sealing cap to prevent liquid leaks and improve your vehicles cooling efficiency. It ensures your engine operates at optimal temperatures, preserving performance and longevity. Easy Installation: Designed to match the original size, this cap allows for a straightforward replacement. Simply remove the old tank cap and install the new one without the need for complicated tools, saving you time and effort. Upgrade your cooling system with our Expansion Tank Cap, designed for durability and superior sealing. Its robust construction and easy installation make it an essential component for maintaining your vehicle's cooling efficiency and performance.