My preference always goes with quick disconnects over t valves for that kind of purpose. Extra set to be able to open and close the loop for filling and draining. Can attach a hose to the extra fitting and then you have the felxibility to kinda do whatever.is it safe to assume adding a t-valve to fill or bleed an AiO system later on is possible?
Some AIO's are non standard tubing sizes so finding anything to actually fit isn't always easy.


