You know, come to think of it... this block has a flaw:
The flow will tend to go right to the outlet, while the rest of the block's water will be barely moving. This could have been corrected by restricting the flow gradually, at the exit of each fins, so that the flow evenly exits the swirly fins.
That's why I'm going with the 2 inch exhaust tube.
Volenti: looking forward to it!
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