1/2" vs 3/8" well 1/2" is bigger so u get more flow and less flow restiction so more water going in and out of each componant in the loop the better. Barbs are just those brass or aluminum things that u push the tubing onto. To fill a closed loop system take the pump put it in a bucket of water turn the thing on with the tube that comes back to the input of the pump spraying into the bucket. Let the system run like that until u get all the air out then while the pump is under water connect the tube to the input of the pump. Take the pump out and dry it off now your done.
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