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You should be able to get a single valve shower fixture at most any hardware store. The big thing would be the access to it. Sometimes you have to cut into the wall on the rear of the shower........depending on which wall it is in order to access that. If you just need the control assy, you might be able to duplicate that depending on the maker. Any of the major hardware stores should have parts. Hope that proves helpful here. Please get back to me if you need more on this as all follow ups are included in our fee.