To replace the cap, first, carefully remove the old one from the vehicle's coolant reservoir. Make sure to do this when the engine is cool to avoid any potential injury from hot coolant. Once the old cap is removed, take the and align it properly with the opening of the reservoir. Gently press down and twist it clockwise until it is securely fastened. Ensuring a tight fit is crucial for maintaining optimal functionality and preventing any leaks or pressure loss. This replacement process is essential for the proper maintenance of your vehicle's cooling system, ensuring it operates efficiently and safely. Features -Color:White -Material:Plastic -Size:4.10X4.10X1.20cm/1.61X1.61X0.47in -Size:4.10X3.50X1.30cm/1.61X1.38X0.51in -Extensive compatibility: offering versatile application -Durable durability: constructed from robust materials that ensure durability and resistance to wear and tear - : engineered with precision for easy installation and a secure fit, reducing the likelihood of leaks -Secure seal: ensures a tight seal to effectively prevent coolant leaks, protecting your engine from overheating and damage -Durable assurance: undergoes strict testing to ensure it meets high standards of Durable and safety, providing peace of mind Package list: 1pcs car water tank kettle cover