Arizona Plumbing Practice Exam

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When connecting dissimilar metals in plumbing, which type of fitting should be used?

  1. Compression fitting

  2. Coupling fitting

  3. Dielectric fitting

  4. Flanged fitting

The correct answer is: Dielectric fitting

When connecting dissimilar metals in plumbing, using a dielectric fitting is essential. Dielectric fittings are specifically designed to prevent galvanic corrosion, which occurs when two different metals come into electrical contact in the presence of moisture. This type of fitting acts as an insulating barrier, separating the two metals to prevent an electrochemical reaction that can lead to deterioration and leaks over time. In contrast, compression fittings, coupling fittings, and flanged fittings do not provide the necessary protection against galvanic corrosion. They simply connect pipes and do not incorporate the insulation that dielectric fittings contain. Therefore, selecting a dielectric fitting is crucial for ensuring longevity and reliability in plumbing systems that involve dissimilar metals.

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