on page 1-2 1-3, No.5 indicate all the pins. On the top right corner, is header for AIO CPU watercooling, lower right, there is header for water cooling
I personally use 2 AIO for my setup. with the CPU AIO connected to the CPU AIO header, while AIO for GPU connected to the lower right header.
Not suer what kinda of setup that you are trying to do, but it works for my 2 AIO set up