Reservoirs and T-lines:
These are an integral part of any liquid cooling loop. Their primary functions include allowing air bubbles to work their way out of the other components and to allow for a point to add coolant to the loop. A reservoir, in it's most basic form, is essentially a sealed box that holds fluid and allows space for displaced air to gather. (See below pictures for common examples.)
As covered in the pump section, there do exist reservoir's that can function as the top to a DDC pump.
http://www.kinexworld.com/images3/dd...ir_2008_3.jpg\
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One of the most common reservoirs found are the Swiftech Micro Res.
http://www.cool-z.com.au/zenshop/images/MCRES-MICRO.gif
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Another common style mounts like a CD-Drive in 5.25” or 3.5” bays.
http://www.kinexworld.com/images3/Re..._uv_blue_1.jpg
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Some of the most popular reservoirs include:
Swiftech Micro Res.
Petra's Tech Shop
EK-RES250.
Petra's Tech Shop
Danger Den Bay Res
Petra's Tech Shop
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A T-line utilizes a T shaped fitting placed in an inverted orientation with the perpendicular barb pointing up. To this, a length of tubing is attached and the horizontal barbs are connected in-line directly before the inlet to the pump. The end of the fill line is usually closed with some form of cap or plug. T-lines are used in place of reservoirs because they are often less expensive and take up less space than a reservoir. The one downside is that air takes much longer to work it's way out of the loop. (See below picture to see a t-line in the middle)
http://upload.wikimedia.org/wikipedi...ing_T-Line.JPG
A t-line setup requires the following:
-T fitting
-Length of tubing
-Tubing Plug or Fill Port