thorilan said:i stand by what i say. i know a bit about making res.
im not talking about construction quality of the materials im talking about functionality and use.
if the reseviors where of good design then like my sytems they would bleed within a minute at 100% and not have a negative impact on the system. most res now increase tubing length not decrease it. not to mention they are positioned porly due to case restraint.
no they cant help it but its still poor in design..
QFT
He has a point you should pay attention to. Not all reserviors are created equal. Bay res's and the like are made for aesthetics and don't function properly. That's why I generally don't recommend reservoirs to people new to W/Cing, they cause more trouble than they are worth in the long run.
YMMV when filling/bleeding your loop with a T-line/res, I've bled a T-line enough I can usually get it done in about 5 minutes. But a proper res (see the ghetto coffee res posted, it is pretty well designed) will bleed a loop faster and offer less restriction to the inlet of the water pump. Notice how the inlet to the pump is 1/2inch while the outlet is 3/8inch and how short the distance between pump and res is. That's how it SHOULD work. Can't do that with a T-line. Also notice how the return to the res is higher than the inlet, and there is minimal distance to the pump. You'll never get that proper function with a commercial bay res.
So to clarify this whole debate...
Homemade res (properly designed and custom fitted)>>Copper T-line >> Commercial res...
As for the ID of T-lines... depends on what you use. I stick to the copper Tees used for 3/8inch ID copper tubing, which actually is 7/16inch ID and 1/2inch OD. No more restrictive than the other fittings used in the loop. But most people use(and pay too much for) the plastic T-lines which has about 3/8inch or less ID.