I got the ball valves today, Lowes didnt have any 2" elbows so gotta head to Home Depot to get those, then off to hopefully complete this if no more snags come along. 

Have you thought about centrifigal force of the..............just kidding. Waiting to see it run.
If you don't put a union on the return you won't be able to remove the multi-valve. The waste outlet will remain dry provided you not depress the handle. When you first start it up you may have to bleed the air out of the chamber by depressing the handle. Be prepared to catch water out of the waste port. No check valves? How do you plan to prime the pump or is it a flooded suction?
Union check
Valves check
Prime the pump ???![]()
How do I prime it? Someone on here said since its below the tank, I doesnt need to and you said it does, so how do I go about doing that?