Cash Acme 3/4-in ID Copper Sweat x 3/4-in OD Copper Sweat Brass Thermostatic Mixing Valve in the Tub & Shower Valves department at Lowes.com
Shower Valve Large Selection Free & Fast Shipping! Fontana Copper shower mixing valve 2/3/4/5 way water outlet cold and hot waterFS6119CV accessories at FontanaShowers.com
Isenberg - 3/4 Inch Horizontal Thermostatic Shower Valve & Trim - 2 Ou – PlumbTile
Universal Three Way Diverter Valve for Thermostatic Shower Systems
Gerber D155000BT Single Handle 3/4-Inch Thermostatic Shower Valve - Bathtub And Shower Diverter Valves - Amazon.com