This is a genuine CORTECO oil filler cap, part number 220122S. Designed to provide a tight and secure seal for your vehicle's engine oil reservoir, this cap is crucial for preventing oil leaks and contamination. Proper sealing of the oil filler cap is essential for maintaining the integrity of your engine's lubrication system. It prevents dirt, moisture, and other debris from entering the engine oil, which could lead to premature wear and damage. The CORTECO 220122S is manufactured to meet high-quality standards, ensuring a reliable fit and long-lasting performance. Replacing a worn or damaged oil filler cap with this CORTECO part will help maintain optimal engine performance and longevity. It is a simple yet vital component for routine engine maintenance.