Add this 3-Way In-Wall Diverter Rough-In Valve to your custom walk-in shower plans. With three outlets, this part can be connected to any combination of shower heads, body sprays, hand showers, and a tub spout for a spa-like design. Six total settings allow for shared water flow between outlets, giving you the ability to use two functions at once. Installs behind the finished wall and is meant to be paired with a pressure balance shower valve.
These are new valves.  You could call them open box since they do not come with sealing tape.  I have three of these available.  Price is per valve.