Ive been using 7/16 in my setup for a few months now and it performs as well as the 1/2 I replaced. There was no change in temps what so ever and it was a bit easier to plumb. The one problem you will have is not getting the 7/16 over 1/2 barbs but getting it off which is next to impossible. I have to slive it off the barbs in order to remove it. You will also have to work it a bit to make it slip over the d4 inlets if you have that pump, since they have that rig.
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