Hi,
I’m sure you guys will know this but I can’t figure out what’s the purpose of the fitting on the thermostat housing?
Identify part?
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Tom
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It's nonsensical. The turbo cars have an aux electric water pump to cool the turbocharger. So, on the turbo cars, that neck is open inside and flows coolant to the pump via a hose. On N/A cars, that white neck is nothing but a block-off plate that is solid inside. The only thing I can figure is that Porsche didn't want to create a separate molding for a proper block-off, so instead just produced that neck using the molds for the turbo neck, but left the center solid/blocked off. 
If you have access to a cnc router, I posted a CAD file a while back to create your own flat block off plate...
https://www.carpokes.com/viewtopic.php?t=2214
If you have access to a cnc router, I posted a CAD file a while back to create your own flat block off plate... https://www.carpokes.com/viewtopic.php?t=2214