Plumber Red Seal · Question
A plumber is preparing to join 1/2-inch (12.7 mm) copper tubing using a soldered joint. Which of the following fluxes is most appropriate for potable water systems?
For potable water systems, a water-soluble, lead-free flux is required by plumbing codes to prevent contamination and to ensure complete removal post-soldering.
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Question: A plumber is preparing to join 1/2-inch (12.7 mm) copper tubing using a soldered joint. Which of the following fluxes is most appropriate for potable water systems?
Answer options: ✅ Water-soluble, lead-free flux
- Acidic zinc chloride flux
- Rosin-based flux
- Petroleum jelly (Vaseline)
Correct answer: Water-soluble, lead-free flux
Explanation: For potable water systems, a water-soluble, lead-free flux is required by plumbing codes to prevent contamination and to ensure complete removal post-soldering. Acidic zinc chloride flux is corrosive and not suitable for potable water, while rosin flux is primarily for electrical work and petroleum jelly is not a flux.
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