Genuine OEM Volkswagen Piston, part number 028107065F001. This piston is a critical component within the engine's cylinders, moving up and down to compress the air-fuel mixture and transfer power. It is part of the assembly marked as number 1 in the diagram. This specific piston is identified by a blue color code. Genuine OEM pistons are manufactured to exact tolerances for proper sealing and efficient combustion, ensuring the longevity and performance of your engine.