Nate152 wrote: I was wanting to ask you what the clear rectangular block is in between the reservoirs, it looks as though coolant is flowing through it and it's a temperature gauge or maybe a flow meter?
Yes it is a flow meter - In particular it is called a rotameter.
Normally used in industry to measure flow of liquids and gasses. I also run an Aquaero MPS400 pressure differential flowmeter in the back of the rig to give me a digital/electronic reading of flow which is monitored by an Aquacomputer Aquaero 6XT and Aquacomputer's software in realtime..
The rotameter up front was just added to the system for visual aesthetics only ie. I thought it looked cool and I had not seen any other builds incorporate one into their systems..!
Here is a taller one that I use for calibrating and testing various watercooling items - The gear below was simply setup to generate an accurate calibration curve for a MPS400 flowmeter.