Genuine OEM Volkswagen Water Box Sound Absorber, part number 5M0863993B. This component is designed to reduce noise originating from the vehicle's water box area, contributing to a quieter and more comfortable cabin environment. It is typically installed in the plenum chamber, beneath the windshield cowl. The absorber is a shaped, felt-like insulation mat, measuring approximately 1.17m in length and weighing 0.37 kg. Opting for a genuine OEM sound absorber ensures precise fitment and factory-specified noise reduction performance, maintaining the vehicle's original acoustic characteristics.