Genuine sealing washer for the brass filler plug on the top of the thermostat housing. Suits all Isuzu 4BD1 engines in the 4x4 and 6x6 Perenties.*** Specific Brand Part *** This product is not specific to one brand. If the product photo shows or the description lists a specific brand, we may provide you with the same or similar part of a different brand. For more information, please see our Terms and Conditions.