This is a genuine CORTECO oil filler cap, part number 220158S. Designed to provide a reliable and secure seal for your vehicle's engine oil reservoir, it is crucial for preventing oil leaks and protecting the engine's internal components from dirt and moisture. The cap is manufactured to meet stringent quality standards, ensuring a perfect fit and long-lasting performance. Its robust construction resists wear and tear from engine bay conditions, offering dependable service. Properly sealing the oil filler is essential for maintaining engine health and optimal performance. This CORTECO cap is engineered to fulfill that vital function effectively.