Plumbing Overflow with 1 1/2"?

clancaster23

Reefing newb
Both of my overflow bulkheads are 2". I plan on reducing right out of the bulkhead to 1 1/2" and doing durso's then running the water down through flex tubing to the sump. Is 1 1/2" ok do this with?

The return will be out of a mag drive 24 and going to be through a closed loop system. I have four return holes, two are 1 1/4" and two are 1" so somewhere along the line I will have to enlarge the pipe from 1" to the two 1 1/4" holes.
 
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