Compression Fitting Won't Fit On Evaporative Cooler Supply Line - Plumbing - DIY Home Improvement | DIYChatroom
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Old 06-01-2015, 11:49 PM   #1
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Compression fitting won't fit on evaporative cooler supply line


There's a section of my supply line to my swamp cooler (1/4" copper) on the roof that had a small crack in it. So, I figured I'd just cut out that small piece and use a compression union fitting to connect it back together. I got the compression fitting from HD, in the section with all the swamp coolers and cut my line. However, the compression sleeve is too small to fit the copper tubing, and so is the threaded part of the fitting that the copper line is supposed to go into. It's not just a tight fit, either - there is no way it's going to go on.

Am I doing something stupid here, or is there something I'm not getting? I've used compression fittings before (on bigger pipe), so I know how they're supposed to work. I cut the tubing with a hacksaw and then cleaned up the ends, so I don't think I deformed the tubing significantly.

Thanks for any ideas.
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Old 06-02-2015, 12:47 AM   #2
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Quote:
Originally Posted by jorgenman View Post
There's a section of my supply line to my swamp cooler (1/4" copper) on the roof that had a small crack in it. So, I figured I'd just cut out that small piece and use a compression union fitting to connect it back together. I got the compression fitting from HD, in the section with all the swamp coolers and cut my line. However, the compression sleeve is too small to fit the copper tubing, and so is the threaded part of the fitting that the copper line is supposed to go into. It's not just a tight fit, either - there is no way it's going to go on.

Am I doing something stupid here, or is there something I'm not getting? I've used compression fittings before (on bigger pipe), so I know how they're supposed to work. I cut the tubing with a hacksaw and then cleaned up the ends, so I don't think I deformed the tubing significantly.

Thanks for any ideas.
Water remained in the tubing, froze and increased the diameter, hence the crack. Replace the tubing.
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Old 06-02-2015, 08:01 AM   #3
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Some refrigeration piping is different than plumbing piping/tubing.
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Old 06-02-2015, 08:11 PM   #4
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Originally Posted by SeniorSitizen View Post
Water remained in the tubing, froze and increased the diameter, hence the crack. Replace the tubing.
Yeah, it just turned out that a bigger section expanded than I realized. I just replaced that whole section, and everything's good! Thanks for the input.
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