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Trouble fitting tubing onto compression fittings

post #1 of 9
Thread Starter 
Hey there OCN
currently trying to put together my dream rig (r3e, i7 950, SLI Gtx580 etc).
Ive hit a snag with my watercooling. I cant seem to get the compression fittings to work properly. I manage to put the barb part into the tubing fine, then struggle to work the locking ring down the tubing. When i get to the part of the tube where it slightly expands from the barb inside, i cannot get the locking ring down, no matter what. Ive tried hot water, pulling as hard as I can, screwing the locking ring down the tubing etc. I get the locking ring about 3-4mm from the thread on the barb part and it just wont go any further.
Am I doing it wrong? did I buy the wrong fittings? the wrong tubing?

I have this tubing and compression fittings:
http://www.pccasegear.com/index.php?...ducts_id=14856

http://www.pccasegear.com/index.php?...ducts_id=13665

Any help would be greatly appreciated.

Cheers
Jack
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post #2 of 9
It appears the tubing is 1/2"-5/8" and so are the fittings, so they match. You really have to crank on those fittings. Try a little dish detergent on the outside of the tubing for lube. Be careful not to get the detergent on the ring.
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post #3 of 9
You don't need to tighten the compression all the way down.

Its hard to explain but you will have some space between the 2 pieces of the fitting.
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post #4 of 9
From what I have read, the wall thickness of the tubing is an important consideration with compression fittings.
    
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post #5 of 9
As said above. the fittings and tubing match. You can't get the fittings threaded at all? Or the screw on ring won't screw all the way to the metal on the second piece?

If the second is your problem, they aren't supposed to go all the way down. Just until they're hand tight. I have different fittings and tubing but there is a small gap between the two pieces.

The images I've attached are hand tight and have never leaked.

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post #6 of 9
there's supposed to be a small gap... u dont need to tighten them all the way
post #7 of 9
I feel you buddy, I really do. I had a hard time getting mine to screw on too.

You have to really push down on them to screw, I know you think it will damage your tubing but it won't. Try to fit as much of the tubing onto components while outside the case as possible, you'll have more room to work with. DO NOT use WD-40.
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post #8 of 9
If you tighten them all the way down, you'll have a ***** of a time trying to get it off if you need to. The compression fitting should naturally stop at a certain point, dont force it to close all the way.
    
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post #9 of 9
Screw them as tight as you can get it , it should be tight enough , the 24 Hr leak test should show any problems
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