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Discuss Mixing metals on compression fittings in the Plumbing Forum area at PlumbersForums.net

Hillabaloo

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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?
 

chris watkins

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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.
 

king of pipes

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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
 

Riley

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You’re fine ;)
Your bigger issue would be if you haven’t put inserts in the plastic pipe or the wrong sort of insert
 

Last Plumber

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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.
 
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Hillabaloo

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

ShaunCorbs

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

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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
 

ShaunCorbs

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Correct ones for compression fittings :)
 
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Hillabaloo

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Thanks. Very reassuring. Just googled and educated myself on the two types of insert. Pure chance that I bought correct ones.
 

Millsy 82

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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.
 

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