Genuine OEM Volkswagen Rear Axle Vent Hose, part number 02D525095L. This hose allows for pressure equalization within the rear axle differential while preventing the ingress of contaminants. It is located at position 13 in the rear axle diagram. The flexible material and precise length of this vent hose are essential for maintaining the integrity of the rear axle assembly and preventing moisture or dirt from entering.