ok, sorry tim but let my stupid questions begin.
On your pic there are 6 holes drilled. The black 2 are returns for the overflows? arent there usually 4?
The yellow is the CL inlet. That would need to be drilled and act kinda like another overflow? being right in the middle like that, i dont understand how it would work.
The reds i actually get, at least i think, those are the returns for the cl, need to be drilled and could be drilled whereever i decide based on the setup, right?
Also, what are check and gate valves?