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Rigid copper is used for main water lines in many homes. You cannot bend rigid copper, so joints and tees must be soldered on. When soldering, always apply flux (also called soldering paste) to both surfaces. Flux retards oxidation when the copper is heated. Always use lead-free or nearly lead-free solder when sweating a copper joint. You always want to solder correctly, the biggest mistake most people make when soldering is failing to get the interior of the fitting and the exteri