Maintain optimal cooling system performance and reliability with the Nextpal Radiator Expansion Tank Cap. This precision-engineered replacement part is designed to provide consistent pressure regulation and long-lasting service. This critical coolant reservoir cap is rigorously rated for a working pressure of 1.4 bar, a specification crucial for maintaining the correct internal pressure within your vehicle's cooling system. This precise regulation effectively raises the coolant's boiling point to prevent overheating and avoid coolant loss, while its calibrated internal spring and valve mechanism work together to ensure consistent performance and protect your engine from potential damage caused by harmful pressure fluctuations. The cap is constructed from high-quality plastic and incorporates a reliable rubber gasket for long-term durability. Designed to directly replace OEM part number 17117639020, this cap is a direct-fit replacement for the original manufacturer. It requires no tools and installs quickly; simply screw it onto the expansion tank filler neck smoothly and securely. This plug-and-play solution ensures accurate placement and immediate effectiveness, making this simple repair possible without the need for professional assistance. It is strongly recommended that you verify that part number 17117639020 matches your vehicle's original cap and consult the detailed compatibility list provided to confirm it fits your specific model and year. Your purchase includes a coolant expansion tank cap that installs immediately on compatible coolant tanks. All necessary components are included in the shipment, providing a reliable and cost-effective solution to restore cooling system integrity and ensure your vehicle continues to operate at optimal performance.