What are the rubber circles for on the back of my pc case? Should I just leave them like that if don't have a need for them? Or are they likely to let I'm dust into the motherboard?
Edit: thanks for all the replies, so just for water cooling I have no need for.
They are external ports for water cooling. They allow you to run the pipes to an exterior location, and I have never seen anyone use them ever. I would leave the rubber grommet as it generally looks nicer than the hole.
Probably for external radiotors. Outside of the case you can make them bigger and thus more silent.
Radiators? Nah, open loop. One end to the faucet, other end to the drain. If youβre on well water it goes right back down to where it came from.
I've always wanted to have to clean hardened calc/lime out of my CPU cooler!