Genuine OEM Volkswagen O-Ring, part number 001321199. This O-ring serves as a critical seal within the transmission system to prevent fluid leaks and maintain proper hydraulic pressure. It is located within the transmission assembly, typically sealing mating surfaces or components. Made from durable, fluid-resistant rubber, it ensures a tight seal. Genuine OEM O-rings are essential for transmission components as they guarantee exact dimensions and material compatibility for reliable sealing and long service life.