Genuine OEM Audi Transmission Piston, part number 01J323929A. This precision-engineered component is crucial for sealing and regulating fluid pressure within the automatic transmission, enabling proper clutch engagement and smooth gear changes. Made from durable metal with an integrated sealing surface, it ensures reliable hydraulic operation. Using a genuine OEM transmission piston guarantees exact dimensions, material integrity, and sealing characteristics, which are essential for the precise and responsive operation of the transmission system.