This is a genuine CORTECO oil filler cap, part number 423130P. It is designed to provide a secure and leak-proof seal for your vehicle's engine oil reservoir. Maintaining a proper seal is crucial for engine health. This cap prevents oil from escaping during operation and also stops dirt, moisture, and other contaminants from entering the engine oil, which can lead to premature wear and damage. Crafted with durable materials, this CORTECO oil filler cap is built to withstand the temperatures and pressures found within the engine bay. Its precise fit ensures easy installation and reliable performance over time.