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					Originally Posted by flaps10  So based on your photo the change over valve is number 18 in the diagram? | 
	
 
Yes. Here is the same diagram, with the rest of the key appended.
 
Clipped from this:
http://www.porsche.com/all/media/pdf/originalparts/usa/986_USA_KATALOG.pdf
edit: well, now that its uploaded that picture is scaled too small to read easily. Lets try adding this:
