plexiglass

My radiator will sit outside the case, so it would be convenient if I had a G1/4" threaded hole in the front of the reservoir (besides the one in the back). There are G1/4" BSP taps such as: amazon.com/Uxcell-a15111900ux0239-Flutes-Thread-Length/dp/B01BF4OE2Y...

For i9-9900. I'm leaning towards EK, but any universal waterblock as well. They have plexi/acrylic and all-copper tops. Also options for stand-alone pump tops. I think I want a clear top, to see any algae or corrosion inside. But has anyone had any trouble with them cracking? Otherwise, would a...