Coolant Reservoir Tank Cap, Radiator Expansion Tank Reservoir Sealing Cover, Replacement OEM#4M0121321E, Compatible with VW Porsche (Blue)

1. This coolant reservoir cap is compatible with VW and Porsche. The OEM part number is 4M0121321E. Please verify your vehicle model and part dimensions before purchasing to avoid compatibility issues2. The reservoir cap provides a tight, airtight seal for the radiator expansion tank. It effectively maintains the cooling system3. Upon purchase, you will receive 1 coolant expansion tank cap. No modifications are required; it can be installed and used immediately

• Compatibility: This coolant reservoir tank cap is precisely engineered to be fully compatible with VW and Porsche models, ensuring a perfect fit and seamless installation. It is a direct replacement for the original factory cap, matching the OEM specifications to work flawlessly with your vehicle's cooling system.
• Part Number: Designed as an exact replacement for the original part, this radiator expansion tank cover features the OEM part number 4M0121321E. It guarantees compatibility with the corresponding vehicle models, eliminating the risk of incorrect fitment and ensuring reliable performance.
• Sealing Protection: The primary function of this coolant reservoir cap is to provide a secure, airtight seal for the radiator expansion tank. It effectively maintains the proper pressure in the cooling system, prevents coolant leakage, and stops air from entering the system, ensuring stable engine temperature and preventing overheating.
• Performance: Crafted from high-quality, heat-resistant and pressure-resistant materials, this coolant cap is built to withstand the high temperatures and pressures of the engine cooling system. It features a robust structure and premium sealing rings that resist aging, deformation and wear, ensuring a long service life and consistent performance.
• Package: Measuring 3.62 " in overall diameter, this cap is sized to match the original equipment. You will receive 1 piece of coolant reservoir tank cap, which is ready for direct installation without any modification.