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Discuss Mixing metals on compression fittings in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Hillabaloo

    Hillabaloo New Member

    Annoyingly I have used a copper nut on a steel isolation valve and the corresponding steel nut on a compression copper fitting (15mm). Should I dismantle and redo? I will have to buy a length of plastic pipe and new olives as well as drain system. Or will it be OK?
     
  2. chris watkins

    chris watkins Plumber

    Are you sure it is steel & not a chrome plated brass fitting? It would be very rare for steel to be used as it rusts.
     
    • Agree Agree x 4
  3. king of pipes

    king of pipes Trusted Plumber GSR

    I very much doubt you have ? Never seen a copper nut on a steel valve i think you are getting confused please post a picture so we can see your delemia. Kop
     
  4. Hillabaloo

    Hillabaloo New Member

  5. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    You’re fine ;)
    Your bigger issue would be if you haven’t put inserts in the plastic pipe or the wrong sort of insert
     
    • Agree Agree x 2
  6. Last Plumber

    Last Plumber Trusted Plumber GSR

    It will be fine (as long as you used inserts mentioned).
    For future reference, the valve is Brass which has been Chrome plated and the gold coloured nut is Brass. There are stainless steel and plastic components inside the valve.
     
    • Agree Agree x 1
    • Disagree Disagree x 1
    • Useful Useful x 1
  7. Hillabaloo

    Hillabaloo New Member

    Thanks very much for the replies. A great relief. I did use inserts in the plastic pipe.
     
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Is it Speedfit?
     
  9. Hillabaloo

    Hillabaloo New Member

    Yes. Hard plastic inserts.
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    The ones with the extra blue o ring eg the super seal ones ?
     
  11. Hillabaloo

    Hillabaloo New Member

    The pipe has the blue plastic lining, but the inserts are solid white. See picture. Should I use different ones for copper compression fittings? IMG_20190604_085300.jpg
     
  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Correct ones for compression fittings :)
     
    • Agree Agree x 3
    • Like Like x 1
  13. Hillabaloo

    Hillabaloo New Member

    Thanks. Very reassuring. Just googled and educated myself on the two types of insert. Pure chance that I bought correct ones.
     
    • Like Like x 1
  14. Millsy 82

    Millsy 82 Plumber GSR Top Contributor!!

    What olives have you used on the speed fit? I've had a couple pop in the past and now only use copper olives as they dig in better.
     
  15. Hillabaloo

    Hillabaloo New Member

    I used copper olives. Also used ptfe tape over olives.
     
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