By: Mario

T-line? Learn what it is, how to use it, and more!
A vital part of the setup, however the most often overlooked, is how to fill the system! I’ve been seeing this quite a lot recently with new people coming into watercooling when I recommend them a $1 T-fitting, they don’t know what it is for. Well, I am hoping to explain in a pretty easy to understand way on how a T-line works, what it exactly is, etc.

As you can see above, a T-fitting is shaped like the letter ‘T’, just upside down. There are three barb openings and that comprises most of what a t-fitting is. :) They come in 2 main sizes relating to watercooling: 3/8" and 1/2" to accomodate your system.

Here is a t-line in action... my current setup. :) Please click on pictures for full size.

The purpose of T-fitting serves a few main reasons:

1. It is designed so that you can fill your system initially with water. You pour water down the tube, to prime the pump, and the pump circulates the water throughout.

(Red=where to pour water and where it would go. Blue is where it circulates.)

2. It is consistently used there after to bleed the system. Bleeding is basically removing the air bubbles from the water, increasing the heat conductivity.

(Blue= Water flow. Red=Location of where bubbles go.)

There are different locations on where to put the T-line throughout the setup. It is recommended that you put it in the HIGHEST location of the setup, however is not required. When at the highest point, it can bleed the fastest.

I recommend a T-fitting over a reservoir mainly because a small object such as a T-fitting is a lot smaller than a reservoir, and is a lot cheaper. (T-line + 1 ft of tubing is maybe $2… compared to reservoirs found at the same site… $25!).

I hope this clears up some confusion. Any comments, questions, suggestion, post in the forum or email me.

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