plumbing - What's the difference between these two types of compression fittings? - Home Improvement Stack Exchange

In my piles of random hardware I have a pile of brass compression fittings for water lines. I have two different types of compression nuts. One has a sleeve inside it. The other doesn't. What's the

PLUMBING GLOSSARY — Kevin Szabo Jr Plumbing - Plumbing Services│Local Plumber│Tinley Park, IL

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plumbing - What's the difference between these two types of compression fittings? - Home Improvement Stack Exchange

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