Creative pump piping 101:
The HO couldn't understand why it wouldn't pump.
Bottom check valve is set in concrete, then reduced to 1-1/2 going into and out of top check. Note the male adapters at the 90's and the slip-fix on the vertical. Whole thing fell apart when I went to cut it off - miserable glue job to top it all off.
And yes, Virginia, those are control valves against the wall in the 1st shot.