A dielectric union is a coupling device that electrically isolates two different metals in a piping system, preventing galvanic corrosion while maintaining a secure fluid connection.

By combining insulating materials (such as PTFE sleeves or rubber gaskets) with metallic components, dielectric unions protect systems where dissimilar metals (e.g. copper and steel) interface.

Key Features & Benefits

Typical features of a high-quality dielectric union include:

• Non-conductive barrier (PTFE or engineered polymer sleeve) to block electrical current
• Corrosion-resistant metal end connections compatible with system piping
• Robust sealing surfaces to ensure leak-free performance
• Pressure and temperature ratings compatible with industrial piping standards
• Designs suitable for potable water, HVAC, chemical, and industrial systems

Each union undergoes testing to verify dielectric isolation, mechanical integrity, and sealing performance under static and operational conditions.

Correct installation—including alignment, support, and torque control—ensures the dielectric union performs effectively, minimizing maintenance and preventing corrosion-related failures.

These dielectric unions provide a reliable interface between dissimilar metals, helping extend system life and maintain fluid integrity in complex piping environments.