The Graf Timing Belt Kit with Water Pump (4-Piece) - 135888 is a comprehensive kit designed for servicing a car's timing belt and water pump. It includes four essential components to ensure smooth and efficient operation of the vehicle's engine. The kit contains a timing belt, a water pump, a tensioner, and an idler pulley. These components work together to keep the engine's timing in sync, regulate the flow of coolant, and maintain proper tension on the belt. This kit is essential for maintaining the overall health and performance of a car's engine. With the included components, the Graf Timing Belt Kit with Water Pump (4-Piece) - 135888 provides a complete solution for servicing a car's timing belt and water pump.