No thanks, barbs are not a problem. I got the 5/8" tubing because it was really cheap ($28.00), not as much for the greater flow. What i really wanted to know is if the 5/8" tubing would reduce water pressure, thus causing a slower flow rate. I was thinking i would just replace the 1/2" barbs on what ever block i get (this will be my first rig) with 5/8" barbs with 1/2" threads.
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