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3/8 ID tubing on a 1/2 OD barb

post #1 of 12
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As a little experiment, i ordered 1/2 OD barbs and 3/8 ID (cheap PVC) tubing to go with my order, and i'm wondering how much of a hassle it'll be to fit those if boiling water is used to soften up the tubing first. I also have a heatgun available should i need it.

Have some of you done this? How did it work out? If it's too much trouble i'll just order bigger tubing, but this is something i'd like to try out.
Edited by Fulvin - 2/11/13 at 11:53pm
post #2 of 12
You can do it but I wouldn't. Upon cooling over the barb it might cause a small kink from the stretching/shrinking. Try it but I will fully expect the tubing to go to hell in no time and a pain to get off, you'll definitely have to cut it off and it just won't be fun.

For 1/2 barbs, 7/16 is about as small as I would go, it's actually about perfect.

Cheap tubing is cheap for a reason. I have some but I only use it with a QDC to drain my loop.
 
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post #3 of 12
Been there, done that, got the finger injuries.
Pic (Click to show)


It is possible but very hard to do. I heated the tubing and the barb in hot water and added a little bit of dish soap to the rim of the barb. Even so it took considerable effort and several heating cycles to force the tubing that far onto the barb; I couldn't get it any further on. Keep in mind that I am a climber too, I have very strong fingers.

I ran like that for about 3 months whilst trying to get hold of 3/8" barbs (I had a lot going on at the time). Whilst it did not split straight away I would be worried about the tubing tearing over time.
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post #4 of 12
I would listen to deafboy. It can crack at some point and take your goodies with it.

P.S. btw OP - I just love your avatar thumb.gif
Edited by McDown - 2/12/13 at 3:09pm
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post #5 of 12
Hate to hijack the thread but would I be able to put 3/8 x1/2 tubing on 7/16 x 5/8 compression fittings?
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post #6 of 12
Quote:
Originally Posted by stringcheese166 View Post

Hate to hijack the thread but would I be able to put 3/8 x1/2 tubing on 7/16 x 5/8 compression fittings?

No.

For compression fittings both the inner and outer dimensions need to match in order to form a good seal. The compression ring needs to be able to secure the tubing, for this it requires the wall thickness to be correct.
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post #7 of 12
Thanks, what is the flow difference between 3/8 and 7/16?
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post #8 of 12
Quote:
Originally Posted by stringcheese166 View Post

Thanks, what is the flow difference between 3/8 and 7/16?

For the lengths of tubing runs we typically use there is negligible difference. Once you get over 3/8" you need some pretty good equipment to measure the performance difference of the loop.
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post #9 of 12
to OP before his thread got hijacked.

i tried to get my 3/8" tubing on the 1/2" barbs on my MCP655 pump, couldnt do it to save my life, tried everything.

so this is what i ended up having to do haha, not pretty but it worked!

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post #10 of 12
I actually have done this on my tubing. I snipped the ends of the tubing and had to use a scrap to fill the gap because it didn't close tight enough. It sure as hell isn't pretty and I am getting new barbs and a new top asap but it works for now
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