This is a genuine oil filler cap from VICTOR REINZ, part number 71-37313-00. It is designed to provide a secure and reliable seal for your engine's oil filler opening. Proper sealing is crucial for maintaining the correct oil level and preventing contaminants from entering the engine. This cap ensures that your engine oil remains contained, protecting vital components from damage and wear. Crafted with quality materials, this oil filler cap is built to withstand the demanding conditions within the engine bay, offering durability and long-lasting performance.