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When soft copper tubing is used the end is flared so that it can seal against the fittings. A flaring tool is used to spread the end of the tubing so that it looks like a small funnel. When you tighten the nut onto a fitting it compresses the copper against the flare on the fitting and makes a seal. It is a dry seal, no pipe dope should be used on a flare fitting. This is almost always on a gas line of some sort, air, natural gas, propane or some other gas. It can be used for liquids, but generally isn't.

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13y ago

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