Genuine OEM Porsche Crankcase O-Ring Gasket, part number 99970757540. This O-ring is designed to seal the crankcase assembly, ensuring a tight seal to prevent oil leaks and maintain internal engine pressure. Its dimensions are 26mm outer diameter, 26mm inner diameter, and 3mm thickness. Genuine OEM parts are manufactured to exact tolerances for a perfect fit and long-lasting seal in critical engine components.