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Pump thread size confusion

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xTrident

Limp Gawd
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Jan 20, 2011
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For the last hour maybe more I've been studying pumps for a future upgrade. I just got an XSPC kit and I'm already in the works to move pieces of it (pump/reservoir mainly) over to another machine and upgrade mine. (I knew finally pulling the trigger on a water loop setup I'd learn more of what I wanted to do)

Anyway, that being said, the pump I think I've set myself on is this - Swiftech MCP655™ - or the cheaper variant that looks practically identical. My question is, looking at this diagram - Pump Chart - and taking special note of the "thread size" on the right there are some pumps that are listed at G 1/4 (which is the thread size for all of my barbs/compression fittings screwing into everything) or it's 3/8" or 1/2" ID... I'm quite thrown off as to what exactly I'm looking at here. Is the G 1/4, 1/4" ID? And are the others essentially G 3/8" and G 1/2"?

I'm using compression fittings on my loop right now, and for the record all I've got is a CPU block, rad, and pump/reservoir in this loop for a total of six fittings. My tubing size is 7/16" ID x 5/8" OD, and the compression fittings are the same, obviously.

My question is: Is it assumed the connections into the pumps, rads etc. are G 1/4 or does that size differ as well as the tubing and what not? My assumption is the sizes do differ considering the flow some people may want/need.

My next question, granted my assumption is correct, is could I get that pump with the 1/2" threading and get a couple compression fittings that would convert the 1/2" thread to my tubing size of 7/16" x 5/8" so it'll work with the rest of my outfit? And if so, could someone link that to me? I checked through FrozenCPU's compression fittings for my tubing size and they all seem to be G 1/4.
 
Compression or barbs are fit to the G 1/4 convention.
That is, all the threaded male portions of the fittings are made to screw into any other female fitting of the same convention.....typically pumps, radiators or reservoirs or waterblocks.

The other measurement....for example 3/8th,1/2,7/16 is the diameter of the other end of the fitting, the part that slips into your tubing.

Example......I use 3/8 ID 1/2" OD compressions. So I need to buy tubing of that specification to conform to my compression fittings.
 
magoo said:
Compression or barbs are fit to the G 1/4 convention.
That is, all the threaded male portions of the fittings are made to screw into any other female fitting of the same convention.....typically pumps, radiators or reservoirs or waterblocks.

The other measurement....for example 3/8th,1/2,7/16 is the diameter of the other end of the fitting, the part that slips into your tubing.

Example......I use 3/8 ID 1/2" OD compressions. So I need to buy tubing of that specification to conform to my compression fittings.
Click to expand...

I understand that part. But first off, let me thank you for replying.

I asked that question before I even ordered the XSPC kit so I had an understanding. My confusion and my question here is specifically on the pump I'm looking at getting. Based on what you're saying I'm assuming the female inlet/outlet on the pump is to the G 1/4 standard? If so, why does that chart say the thread size is 1/2"?
 
xTrident said:
I understand that part. But first off, let me thank you for replying.

I asked that question before I even ordered the XSPC kit so I had an understanding. My confusion and my question here is specifically on the pump I'm looking at getting. Based on what you're saying I'm assuming the female inlet/outlet on the pump is to the G 1/4 standard? If so, why does that chart say the thread size is 1/2"?
Click to expand...

All of the MCP 655 pumps come with a front that have barb type connectors:

Like this:http://www.sidewindercomputers.com/swmc12vdcpu.html
This example the pump has 1/2" barbs that would require a 1/2" ID tubing. Some of the MCP 655 have a front with 3/8" barb connectors.
The one you linked from Frozen comes with 1/2" barbs.

You can see that the front piece is removable.

Your XSPC front screws on to the pump using the large ring you see. I'm sure your XSPC pump front is G 1/4 so you'll be able to use compressions or barbs of your liking.:D

I don't work for anybody.(disclaimer)
That said, you will find the best pump prices at sidewindercomputers.com. You can see the variable speed pump I linked is a full 25 dollars cheaper than Frozen!! that and the shipping will be lower too.:p
 
Last edited:
magoo said:
All of the MCP 655 pumps come with a front that have barb type connectors:

Like this:http://www.sidewindercomputers.com/swmc12vdcpu.html
This example the pump has 1/2" barbs that would require a 1/2" ID tubing. Some of the MCP 655 have a front with 3/8" barb connectors.
The one you linked from Frozen comes with 1/2" barbs.

You can see that the front piece is removable.

Your XSPC front screws on to the pump using the large ring you see. I'm sure your XSPC pump front is G 1/4 so you'll be able to use compressions or barbs of your liking.:D

I don't work for anybody.(disclaimer)
That said, you will find the best pump prices at sidewindercomputers.com. You can see the variable speed pump I linked is a full 25 dollars cheaper than Frozen!! that and the shipping will be lower too.:p
Click to expand...

Oh! I see now... Christ, I was just assuming a barb/compression fitting would still screw into the pump. I didn't know that those outlets were already barb fittings.

So what I would want is something like this - http://www.sidewindercomputers.com/sicumclad5wi.html

Also thanks for pointing out the prices. Sidewinder does seem quite a bit cheaper.
 
xTrident said:
Oh! I see now... Christ, I was just assuming a barb/compression fitting would still screw into the pump. I didn't know that those outlets were already barb fittings.

So what I would want is something like this - http://www.sidewindercomputers.com/sicumclad5wi.html

Also thanks for pointing out the prices. Sidewinder does seem quite a bit cheaper.
Click to expand...
Yes, you could do that, but most people get this, or something like it.
http://www.sidewindercomputers.com/bid5modtop.html

You remove the stock top (buy a pump with a plain old stock top, nothing modified unless it strikes your fancy) and replace it with the modified one.

Benefit: the Bitspower I show in the link has G1/4 threads so you can place either barbs or compressions, and secondly it has several locations for the fittings so you can arrange them according to the space you have.
Plus they look way better than the stock pump front.:D
 
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