E30 Zone

Hello

I renewed all the hoses and seals on my M10 318i engine.
Now, i refitted everything, but i still have a connection that i don't know
for what it is



The connection on the cylinderhead cover has the same diameter, is it possible that it should be connected with the one on the picture?

Help wanted

if im not mistaken there should be a breather hose from there to the rocker cover

rocker cover = cylinderhead/valve cover ?

Same thing.