Here's a stand-back view of the plumbing rough. The large brass colored piece in the center is the temperature controller.

These rough plumbing pieces have separate controls for temperature, and flow (on/off). That's cool because you can set the temperature where you like it, but water only comes out when one of the diverter valves is opened. Those gray cone looking things are the rough diverter valves.

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shower plumbing rough