Here's some pix of my plumbing. It's obviously not done, but it will hopefully be done by the end of the week, after we get all of the squirts sent out.
Here's the Super Squirt connected by (4) SS unions. I was going to use threaded unions, but that means attaching male adapters to each side of the union, thus adding 3-5" to the total wingspan of the squirt, and I just don't have that much room. I chose SCH 80 unions because they're more reliable. I go with SCH 40 with everything else, but not my unions. Over time, the socket can crack due to pressure at the seams, and I've learned that by experience. SCH 80 is thicker, and just won't have the same problems.
I originally ordered threded unions, but I looked all around, and found 4 slip unions that will do the job.
I probably could have gone with ball valves at the 4 inlets to the tank, but I just like gate valves more, there's better flow control. I'm not done with this, but as you can see, there's a gate valve at each inlet.
Sequence Dart - 1 1/2" outlet, 2" inlet. All plumbing is 2" other than from Super Squirt to bulkheads, which is 1". The reason is so that I can keep highest flow I can. I also have 2" leading into the inlet so that the pump has plenty of water to pump. From my understanding, pumps will have higher longevity if they are fed enough water; but controlling the outlet of the pump is preferable. 2" gate valve, 2" unions included also. Above the gate valve will either be (2) 90s or (2) 45s, whichever will fit better. Then, it will be connected to the squirt. I'm going to have a Tee in there above the gate valve for utility purposes.