These float valves are used on all Vanagon from 80-91. This is the plastic vent valve that is located on the top of the gas expansion tanks that are located in the front driver's side and passenger wheel wells of the 2wd Vanagon. These are also used on the top of the Syncro gas tank. They require a rubber seal which is N90100501. There are two used on the 2wd and 2 used on the Syncro Vanagon gas tank. If you are purchasing the syncro gas tank seal kit they are included.