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Thanks. They weren't o rings but washers. I didn't realize the chokes unscrewed per the diagram. Thanks to you two 1920s showers are once again operational! Thanks!

anyone aware of a source for the o rings for these mixers?

many thanks this is helpful!

I have what i believe is an american standard shower mixer. I think its a re -nu standard but cant find any info or pics of this despite searching on Google extensively.
initially it was leaking as...