Thank you azsoccerpop,
I figured this is by design from the manufacturer. So I assume it would be o.k. but, i did't want to end up with water spraying everywhere either due to pressurization inside flex tubing. I think I'll just use a Y connector then that has 2 x 1/2" outlets down directly from 1.5". Each return I'll install gate valves so I can dial in the flow as needed.
With a manifold on my return lines to other devices, and /or maybe even cycling water back to one of my filtration containers to reduce pressure if needed, I'll be able to dial in the flow pretty well. I'm guessing there will be a lot of head loss on the manifold itself if there's two to three valves open.
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