The Genuine VW / Audi Timing Belt Kit - 178645 is a comprehensive package of essential products designed specifically for cars made by Volkswagen and Audi. This kit includes a timing belt, tensioner, and water pump, all of which are crucial components for the proper functioning of the engine. The timing belt is responsible for synchronizing the rotation of the crankshaft and camshaft, while the tensioner ensures that the belt is properly tensioned. The water pump circulates coolant throughout the engine to prevent overheating. These products are all high-quality and genuine, ensuring optimal performance and durability for your car. This kit is an essential maintenance item for any VW or Audi owner to ensure the smooth operation and longevity of their vehicle.