Hello Mr. Tore,
The drawing does not match up well with the photo. The savaging air filter looks to be attached to a cast manifold. I guess the cast manifold could wrap around the back and make the connection at the bottom. The drawings indicate the savaging air intake is on the lower part of the compressor 1st stage.
In the photo there are two lines that are attached at the top; one on the forward casting air inlet 4th stage, and the other one is on the compressor 1st stage the 1st stage air outlet (or a cooling water outlet)? Your bottom arrow is pointing to the 1st stage compressor air inlet which is at the casting location but internal beyond the 4th stage casting???
I believe the line near the red arrow is the cooling waterline to the 4th stage, and the smaller line goes to a pressure gauge (4th stage pressure?)....
How wrong am I...
Regards,
Don_