A dielectric fitting is used in piping systems to connect different metals.

• A. To connect different metals while preventing corrosion
• B. To adjust pressure
• C. To seal leaks
• D. To increase flow

Answer: (A)

Dielectric fittings provide electrical isolation between dissimilar metals in a piping system to prevent galvanic corrosion. By inserting a non-conductive barrier between the metals, they stop electrical current from flowing through the metal connections, which slows or prevents the electrochemical corrosion that occurs when different metals are in contact in the presence of water or other electrolytes. This lets you safely join metals like steel and copper without the accelerated deterioration that would otherwise occur. They aren’t intended to adjust pressure, seal leaks beyond maintaining a seal in normal operation, or increase flow, so those functions aren’t what dielectric fittings are used for.