Service. What is the pipe?

Hi. I acquired my late 06 K12 a couple of weeks ago. She only has 45K on the clock so has had a relatively easy life. Spent the morning doing an oil change, air filter, and then changed the plugs. What is it with the square nuts on the manifold. After wrestling with them for half an hour they are definitely getting changed out for standard nuts and bolts! Anyway to get to my question. At the top right of the manifold cover there is a bracket holding a “breather” pipe that seems to come from the gear box. Or am I missing something? Car runs great.
 
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