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The mainboard has been seated securely into the case. As you can see I left out the PSU and drives to make sure we have lot's of space to work with here as we are now connecting the rest: reservoir, pump, radiator.
Here we prepare the rest of the tubing for the entire flow circuit. Our flow line is as follows:
reservoir -> CPU -> radiator -> pump -> reservoir.
Do not secure the pump just yet into the casing. If there is air stuck in the tubing you really want to move that pump around a little. Also if it would leak, at least it would leak outside the case.