Post-hold-water-testing. No problems.
1" Diameter fill-hole cap from Mcmaster-Carr. 3/4" NPT thread, black polypropylene.
Center divider placed...
...looks a bit high, doesn't it? The water path, in green, from return to pump inlet. The space between t he top of the drain plug and the top of the divider is too small. The purpose of the divider is so that bubbles can't go immediately back into the pump intake. This res did a beautiful job of bleeding all the air out of the system in under 2 minutes!
Why don't we take off some material? Material to be removed is highlighted in green.
Halfway through. The endmill didn't have enough cutting surface to do the whole thing at once.
Action shot.
Smoothing the end, all done.
Shortend divider in place and glued up.
Top clamped on, no shortage of clamps here.
All done, just not installed. This is the "Front" because it faces the front of the case. A bit dusty in this shot... :shrug:
This is the "Back" - it faces into the main compartment of the case.
