I just finished wb, I'll start test run to fill the cycle, and then I'll test the block.
Anyway here is modified block with brass top and copper nozzle inlet (can't wait to test my theory)
Here's pic of the setup with silicon tubing (way to expensive 8$/m) and you can see small brass valve at the bottom, that's where I let water out of the system
Here with block inside ready for filling:
And here's how I trapped air a lot more efficient than before,for now I just use fill hose for air trap, I'll probably add small lexan reservoir just because it looks so hot.