Genuine OEM Volkswagen Diagnostic Pump Filter, part number 5C0906621. This filter is designed to clean the air entering the diagnostic pump, which is a crucial component of the evaporative emissions system. It ensures the pump operates correctly and prevents contaminants from affecting the system's performance. Weighing 0.069 kg with dimensions of 0.113m x 0.085m x 0.07m. Using a genuine OEM filter guarantees the correct filtration efficiency and fitment, maintaining the integrity and compliance of the vehicle's emissions system.