Ohio Triple Thermostatic Shower Valve with 3 Outlets (controls 3 functions, 2 at a time) - Qualitex
ALFI BRAND 3-Handle Shower Mixer with Sleek Modern Design in Polished Chrome AB4001-PC - The Home Depot
Use All Options Once) 3-way Brass Thermostatic Shower Valve Kit, HOMEDEC Shower Diverter Flow Control Replacement Valve for Shower System (Concealed Vertical installation, Chrome) - Amazon.com
QISHENG 3 Way Solid Brass Shower Diverter Valve Concealed Thermostatic Mixer Valve with Trim for Bathroom Shower System, Can Simultaneous Operation, Flows Can Be Controlled, Brushed Nickel - Amazon.com