The Saturday Morning Plumber’s Quiz: Can You Name These 20 Hardcore Plumbing Tools?
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When "sweating" copper pipes together, what paste must be applied to the joints before heating to help solder flow?
Explanation
Plumbing flux (acid paste) is essential. Swept onto the clean copper surfaces, it chemically cleans the metal when heated, preventing oxidation and allowing capillary action to draw molten solder deep into the pipe fitting joint.