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Hello @danil22
Thanks for sharing your question about your shower mixer. Your idea of changing your shower mixer with a new one but leaving the original body in the wall is clever thinking. However, you have run into one of the things that the manufacturers have not yet settled on or standardized and that is the sleeve thread location and pitch. Shower mixers on the outside have more or less settled on standard sizes that range from 32mm all the way to 50mm diameter shower mixers. This also standardizes to a point the ceramic cartridges used on the shower mixers.
In theory there is a very good chance that the handle on the Mondella Cadenza will fit the 40mm cartridge of the old shower mixer. According to my analysis you should be able to use the same body fitting and brass locking ring along with the cover flange of the old shower mixer. You can then take the wall flange and handle of the new shower mixer and fit it onto the old set on your wall. This is on the condition that the body of the old mixer is the same size as the new mixer. A bit of testing in regards to size and shape will need to be done, but I'm optimistic that there is a high chance that it will fit.
If you have any other questions we can help with, please let us know.
Eric
Hello @danil22
My apologies, I was under the impression that you had purchased a chrome finish. At this particular juncture, I propose holding back on testing another cartridge as there are just too many variables as I mentioned regarding the non-standard sections of the mixer. I believe that it would be more cost effective to engage the services of a plumber to install your preferred shower mixer.
The other option of course is to paint the existing body in matt black to match the other pieces that you have. I also suggest having a look at this discussion - Spray painted tapware by @lifestylebymari.
If you need further assistance, please let us know.
Eric
