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Old 08-09-2010, 05:58 PM   #1
ascha
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Default Compression Fitting

I'm using a Watts (Lowes) compression fitting with vinyl tubing but I can't get it to stay in the fitting itself. Do I need to change the compression nut or something?

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Old 08-09-2010, 06:05 PM   #2
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I don't think that compression fittings such as the one shown are designed to be used with vinyl tubing. They are intended for soft copper tubing. Most use barb type fittings and a hose clamp for the plastic tubing.

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Old 08-09-2010, 06:09 PM   #3
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I had compression fittings on the end of my IC with vynil tubing in it. I had to crank those suckers down HARD to get the tubing to stay. then, after using it once, the vynil got soft and would slip righ tout.

I evneually got slightly larger tubing (had some left over form something) and hose clamped it straight onto the copper. This worked so much better.

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Old 08-09-2010, 06:11 PM   #4
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Agree with all posts. Barb and clamps for flexible/crushable tubing.

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Old 08-09-2010, 06:41 PM   #5
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You can get away with it if you use a internal support sleeve and a softer ferrule material like nylon, but there's really no benefit to using a compression fitting for soft tubing.

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Old 08-09-2010, 07:08 PM   #6
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Thanks for all the responses. I'll just pick some barbed fittings instead, thanks.

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