This is the diaphragm for the air/oil separator on the Porsche Cayenne V6 and V8 engines. Over time, it will tear causing a vacuum leak on the motor. Porsche will only sell you the whole vavle cover at a cost of over $600 and a few hours labor when you only need to replace this diaphragm.
We've discovered there are 2 versions of the 4.8L diaphragm. If your cap is closer to the front of the motor, it uses the 4.5L version (see picture labeled 3). If you cap is closer to the middle of the motor, it's the 4.8L version (see picture labeled 4).
Buyer to pay actual shipping costs. Please contact us with any questions or to discuss ordering.
Above-4.8l motor that uses 4.5l diaphragm
Below-4.8l motor that uses 4.8l diaphragm