di-electic unions

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    • #277119
      MasterPlumbers
      Keymaster

      I have been told that a di-electic union is needed between the galvanized inlet and outlet of my new water heater and the copper pipe. Currently there is a brass fitting between the copper and galvanized waterheater nipples. Does the brass going to stop the problem the the di-electric union is needed to stop? Thanks for any clarification as to the need of this union,
      Mike.

    • #295460
      DUNBAR
      Participant

      The union has a plastic clip and a rubber washer that interrupts the continuity through the two metals which slows down electrolisis.

      The connection you have does not.

      I always use short brass 3/4 nipples and female dielectric unions on all water heaters.

    • #295461
      nicktheplumber
      Participant

      Using a 6 inch brass (low zinc type) nipple is considered an adequate connection between ferrous and cupric pipe, and it will perform as well as the dielectric union.

      NtP

    • #295462
      Selgas
      Participant

      We use dezincdefied (poor spelling here) brass fittings on cylinders for exactly the same reason.



      Selgas Services Ltd
      Craftsman Gasfitters, Plumbers, Electrical Service Technicians

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