On my CPR overflow, I have 2 1 inch pvc overflows with 1 inch valves adapted to 1 1/4 black flex sump hose for ease of sump/equipment service.On one section ,I used clear 1 1/4 tube to see what flow was like.There is still ample room for water. On the return I have 1 inch pvc in and out of a Mag 12. The 1 inch is equally split into 2 3/4 lines which inturn are slit into 2 1/2''lock lines. No problem with blockage and no throttling of valves was required.
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Sebae
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