Someotherguy, the pics that you posted are what is called a "sectional valve assembly". It consists of an inlet section, feed from pump, and an outlet section, return to tank. In between are the various operation function sections, stacked together, boom, arm, bucket, etc. That "section", whatever function it is, that you noted as an "adjuster", that adjuster is actually a relief valve for that particular section. And the section that you noted as "thumb spool" section, it doesn't have relief valves, which puzzles me, just where are the relief valves for the aux circuit?
But that's a different issue, not to get side tracked on that. I would like to know where that hose that connects to the side of the manifold block on side of boom runs to myself.