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Help... Coolant leaks from?

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Hi everyone this is my very first post and I'm new to Renntech. I have just purchased a used 1998 Porsche Boxster 986.


I have noticed it has a drip or leak coming from what seems to be the center of the rear of car (I don't believe It's the water pump). As I have got under vehicle to check where leak is coming from there appears to be a rubber gasket or plunger of sorts attached to clear plastic tube in which rubber hoses connect to it. It is lodged into a metal bracket and is directly next to, and above the transmission filler plug. 


I would like to repair this but I have zero knowledge of part description for new part purchase.


Anybody know if this is a check valve? 


On the diagram below, I believe my coolant leak is coming from #12... Anybody know what this party is?



Edited by Mr know it not
Found diagram with part... Still do not have info on what name is part though.
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