Read what I post above. Half inch outside diameter fittings has 3/8" inside diameter bore. When you apply 1/2" tubing over the 1/2" barb with 3/8” inside diameter you will have restriction. Reason: The water has expanded to the 1/2" ID tubing then the water is force through a 3/8" inside diameter barb causing restriction. By stretching the 3/8" tubing over the 1/2" outside diameter barbs you now have a true 3/8" system. A true 1/2" system would have to 5/8" barbs with 1/2" inside diameter bore. You will not see a difference using 1/2" or 3/8" in temps. What your going to see is by increasing the flow by eliminating flow restriction is less heat being produce by the pump which will drop your temps.
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