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7/16 tubing on 1/2 compressions

post #1 of 11
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So I just purchased some 1/2 id 5/8 od compression fittings from a fellow member. I'm wondering if I can use 7/16 id 5/8 od tubing with them or if I need to get 1/2id. I know that usually the tubing must be exactly the same size as the compression fittings but since the tubing and compressions would have the same od, I was hoping this was possible. If not I'll just go with 1/2 tubing. Thanks guys.
Edited by omnius19 - 5/20/11 at 7:39pm
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post #2 of 11
For sure you can, that's what I use, except the compression fittings.

You can just slide them on barbs without clamps and it should be fine. The fittings will fit since OD is the same.

0 leak, nice and tight seal.
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post #3 of 11
Quote:
Originally Posted by omnius19;13562456 
So I just purchased some 1/2 id 5/8 od compression from a fellow member. I'm wondering if I can use 7/16 id 5/8 od tubing with them or if I need to get 1/2id. I know that usually the tubing must be exactly the same size as the compression fittings but since the tubing and compressions would have the same od, I was hoping this was possible. If not I'll just go with 1/2 tubing. Thanks guys.

So the tubing is smaller in diameter than the fitting? If I understand correctly, just use some hot water or a hair dryer to soften the tubing as you coax it onto the fitting. Should be nice and tight!
    
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post #4 of 11
do use clamp dont cheapen out.
somebody did this and it leaked..
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post #5 of 11
You can be a daredevil and go 3/8 over 1/2. Just need to dip the tube in hot water. 7/16 works just find though, no need for clamps as the tubing molds to the barb.
post #6 of 11
Wow, so many people missing the point.

I would not advise using 7/16" * 5/8" tubing with compression fittings meant for 1/2" * 5/8" tubing. The problem is that the tube wall will be thicker for the 7/16" tubing, so when it is sitting on the barb of the compression fitting the retaining ring might not be big enough to engage the threads.

It might work OK, it might not even fit or it might cause a leak. Tubing is cheap, why not grab some to match the fittings and sleep easier at night.


Edit: If you have the tubing and the fittings already, why not give it a try and see how it fits. You can always put together a quick and simple test loop to check for leaks.
Edited by GingerJohn - 5/19/11 at 11:44am
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post #7 of 11
yes exactly compressions are made in spec with the OD in mind as well.
post #8 of 11
I would not do this with compression fittings, only barbs. Compressing rings are designed for specific OD size.
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post #9 of 11
Quote:
Originally Posted by runeazn;13562504 
do use clamp dont cheapen out.
somebody did this and it leaked..

yes. no retension device is asking for leak
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post #10 of 11
It won't work, the 7/16id x 5/8od tubing has thicker walls than the tubing the fittings are designed for, you won't be able to thread the compression ring down.
Quote:
Originally Posted by Blostorm;13562478 
The fittings will fit since OD is the same.

If you slide 7/16id tubing over a 1/2" barb, stretching the ID of the tube to 1/2", the OD of the tubing will also end up larger than 5/8.
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