I can install you some 1/4" fitting, I have some here....
actually, for a severally flow-deprived system, you would not want an open channel block..... Remember that those designs depend on a superior flow-rate, produced by a powerful pump, in order to generate the turbulence inside the block. running one of those blocks with a much reduced flow-rate would yield massive laminar flow throughout the entire block.
for a small pump situation a more restrictive block would yield much much better results....
do not look at the block as having to make a pumps life easy. that would inevitably result in severally reduced thermal performance of the block. The block should be responsible for one thing only.... Get the heat from the core into the water, as effectively as possible.
for this, smooth surfaces is not good...Oh yes! good for flow-rate....but that is the pumps responsibility, not the blocks. Obviously if you are going to get a block that makes it easy for the pump, the block ain't going to have nearly as much thermal performance as it should have.....
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There is no Spoon....
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