Image below is an approximation of my system layout. Trying to figure out where a drain port can be installed but cant for the life of me see how such a thing can work as inteded with the components laid out like this.
If a drain is installed at the bottom of the reservoir only that top rad and the reservoir will empty.
If a drain is installed just before the inlet/outlet at bottom rad, I assume the GPU/CPU blocks and top rad might empty after a long while and the reservoir as well as bottom radiator will retain all fluid as I understand it. I assume the pump top will prevent gravity from emptying the reservoir/top rad path.
If a drain is installed at the bottom of the reservoir only that top rad and the reservoir will empty.
If a drain is installed just before the inlet/outlet at bottom rad, I assume the GPU/CPU blocks and top rad might empty after a long while and the reservoir as well as bottom radiator will retain all fluid as I understand it. I assume the pump top will prevent gravity from emptying the reservoir/top rad path.