Joints between different metallic piping materials should be made with approved dielectric fittings or brass converter fittings.

• A. True
• B. False
• C. Not applicable
• D. Only for copper prior to joining

Answer: (A)

When two different metals meet in a piping system, they can form a galvanic pair where electrons flow from one metal to the other in the presence of moisture. That electrical path accelerates corrosion, leaks, and joint failure over time. To stop this, approved dielectric fittings insert an insulating barrier between the metals, breaking the electrical connection. Brass converter fittings serve as a transitional piece that is designed for joining different metals while maintaining a sealed, compatible interface, often used in systems where a direct metal-to-metal connection would create a galvanic path. Using either method keeps the metals from directly contacting in a way that would promote corrosion, helping the joint last longer and stay leak-free.