This is a genuine CORTECO oil filler cap, part number 220066H. It is designed to provide a reliable and secure seal for your vehicle's oil filler opening. A properly functioning oil filler cap is crucial for maintaining the integrity of your engine's lubrication system. It prevents dirt, debris, and moisture from entering the crankcase, which can lead to premature wear and damage. Ensure your engine is protected by using a high-quality replacement part from a trusted manufacturer like CORTECO. This cap is built to withstand the temperatures and pressures found under the hood, offering long-lasting performance.