3/8" is by far cheaper than 1/2" variety (according to Joe). And Alives, just because you have one restriction in your hose doesn't make the flow rate of the entire system act like it was made of 3/8" tubing.... but besides, I made my own water block and designed it to have the same cross sectional area (actually a tad more) than 1/2" tubing.
Rich W.
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