DU Series

Dielectric Union

Dielectric Unions are designed to be installed between pipes made from dissimilar metals to prevent accelerated corrosion and deterioration in the piping system due to galvanic and stray current. It consists of a union nut, two tail-pieces, a gasket & a sleeve that separates the tail-pieces to prevent an electric current from occurring. This series is ideal in application such commercial and residential as hot water storage tanks, chilled water processing tanks, steam, gas, FCU’s, AHU’s and other water piping applications.


  • Max. Working Pressure: 300 psi (20.6 bar)
  • Max. Working Temperature: 180ºF (82ºC)

Heavy Duty (Suffix – HD)

  • Max. Working Pressure: 435 psi (30 bar)
  • Max. Working Temperature: 230ºF (110ºC)

Standard Connection Types

  1. Male Threaded Steel x Male Threaded Brass (DUMM)
  2. Male Threaded Steel x Female Threaded Brass (DUMF)
  3. Male Threaded Steel x Brass Solder (DUMC)
  4. Female Threaded Steel x Male Threaded Brass (DUFM)
  5. Female Threaded Steel x Female Threaded Brass (DUFF)
  6. Female Threaded Steel x Brass Solder (DUFC)

Other material connection types are available on request.

Need More Information?

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