This is a genuine CORTECO oil filler cap, part number 220133S. It is designed to provide a secure and leak-free seal for your vehicle's engine oil filler opening. Maintaining a proper seal is crucial for preventing oil from escaping the engine and for keeping contaminants like dirt and moisture out. This cap is manufactured to meet stringent quality standards, ensuring a precise fit and durable performance. Replacing a worn or damaged oil filler cap with a genuine CORTECO part like the 220133S will help maintain the integrity of your engine's lubrication system and contribute to its overall longevity.