Replacement membrane for the vacuum cans "circulating air" (928 573 077 04 / 92857307704) or "defroster nozzle" (928 574 077 02 / 92857407702). Suitable for all Porsche 928 models.
The membranes in the vacuum cans often show cracks after many years, which lead to leaks in the vacuum system and thus to malfunctions. For repair, the original vacuum cans are opened and the diaphragm replaced.
