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Water Cooling Compression Fitting Size, Need Help!

post #1 of 3
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I have an XSPC Raystorm 750 RS240, and I have had the system running for around 6 months. I am doing some watercooling maintenance and its going to need some new tubing(because the old tubing is just a total mess lol.

All of the water cooling components have G 1/4" threads and the website says that the barbs included are 1/2" barbs.
The tubing that I have with the system (cheapo stock tubing) is 7/16" by 5/8" tubing, so it is already somewhat of a squeeze onto the 1/2" barbs.

Very soon I am buying some Primochill PrimoFlex Andvanced LRT 3/8" ID 5/8" OD Tubing (that's the plan for now at least).


Now if I want to use 3/8" ID Tubing with compression fittings, obviously I have to buy new compression fittings, so my question is, do I need 3/8" compression fittings with G1/4" threads? So would I need something like this: http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_346_393_614&products_id=26973 ?

I'm just a little confused on some of the measurements, what is G 1/4"? Is this the size of the hole going into the block? If so, there is no way the hole going into the block is 1/4", I measured it and it's like 1/2" inch. So if every component has 1/2" openings, does this mean that the 7/16" tubing I am currently using now is a bottleneck? Because I am using a tubing that has more of a constricted space than the space the barb offers, so in order to get optimal water flow, the tubing ID should match the So going down in size to 3/8" ID tubing, is technically more of a bottleneck becasue I am stepping even farther away from the amount of water a 1/2" barb offers. Idk if this difference is noticeable at all but just wondering thanks!

Thanks!
post #2 of 3
G 1/4 refers to the thread size for the fitting and the block hole, it's all tha same standard size. As for the fittings, when using compressions the fitting and the tubing just need to have the identical ID and OD, all of them will have G 1/4 threading.

You will have no noticeable difference with the tubing size change.
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post #3 of 3
1. Yes, you need G1/4 threaded 3/8" x 5/8" compression fittings like the one you linked.
2. There is no significant performance difference between 3/8" tubing and 1/2" tubing. The main bottleneck is in your blocks.

G1/4 is a standard thread in water cooling, pretty much everything uses it. You can still find some G3/8 components but they are very rare.

The thread is a British Standard Pipe thread (BSP).

The 1/4 used to be a measurement of the inner diameter of the pipe but is now just a number (very roughly equivalent to the radius of the fitting).

The "G" denotes parallel thread and bore, as apposed to tapered thread and / or bore fittings.

But all you really need to know is that a G1/4 fitting goes in a G1/4 hole, which is what most components have.
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