This CORTECO oil filler cap, part number 220156S, is designed to provide a reliable seal for your engine's oil reservoir. Properly sealing the oil filler prevents contaminants from entering the engine and ensures that oil does not leak out during operation. This is crucial for maintaining engine health and preventing potential damage. Crafted with quality materials, this cap is built to withstand the typical engine bay environment and maintain its sealing integrity over time. It is a straightforward component to replace, ensuring your engine remains protected.