14 Pin Connector Housing Dome Cap for various Porsche models.
Porsche part no 999 652 436 40 (forms part of 911 612 115 03)
 
Unlike the original which easily cracks, this modern reproduction is made from ultra tough PA12 nylon which is resistant against chemicals and heat.
 
Please note that this is not the complete unit, it's just the cap that snaps onto the connector.