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Discuss Mixing metals on compression fittings in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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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?
 
The fitting was from screwfix described as brass, steel and plastic.

https://www.NoLinkingToThis/c/heati...p=managedredirect-_-plumbing-_-isolatingvalve

I attach two photos. Thanks for help so far
IMG_20190604_074236.jpg
IMG_20190604_074257.jpg
 
The ones with the extra blue o ring eg the super seal ones ?
 

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