This is a genuine CORTECO oil filler cap, part number 423003P. It is designed to provide a secure and leak-free seal for your vehicle's engine oil reservoir. Maintaining a proper seal is crucial for engine health. This cap prevents contaminants from entering the engine and stops oil from escaping, which can lead to engine damage and environmental pollution. Crafted with quality materials, this CORTECO oil filler cap offers durability and a precise fit, ensuring it functions effectively for its intended lifespan. Replacement is straightforward for most vehicle makes and models.