Cathar said that 7/16" has slightly higher flow rate than 1/2" because 7/16" is closer to the actual inner diameter of the barbs, while when using 1/2" tubing theres a slight resistance to flow because the water is crashing into the whole front of the barb including the space surrounding the inlet (concave dome like space around the opening of barb, if that makes sense)
In relatively small Lengths, 7/16" will have higher flow rate than 1/2".
If using 7/16", it fits very snung on 1/2" barbs, and clamps are not really needed
I had zero clamps on all 9 barbs in my setup, never a spill because took lots of strenth to pull the tubing off the barbs, its that snug
(but good to have for safety precaution)
Fan/Shround in progress..
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