Genuine OEM Volkswagen Piston Complete, part number 03H107066CD. This part is a complete piston assembly, including the piston itself, piston pin, and piston rings. It is a critical component within the engine's combustion chamber, responsible for converting pressure from expanding gas into rotational motion. This piston is designed for precise fit and optimal performance within the engine. Genuine OEM pistons are manufactured to exact tolerances to ensure proper sealing, heat dissipation, and durability for a long service life.