This is the small coolant gasket that goes between the pipe that goes under the main pulley and the body of the water pump on the 1.9l Vanagon. It also goes under the block off plate on the driver's side head (towards the front of the van). It is also used on the long pipe that runs above the main pulley on the end that is under the alternator bracket. On a 2.1l it is used at the water pump for the pipe that runs under the main pulley, and under the coolant nipple that is under the alternator bracket as well. One of these gaskets is included when you purchase a water pump, however if you have a 1.9l Vanagon you will want to buy one more of these because you will be pulling the long pipe above the main pulley to replace the pump.