Grohe 29136000 Starlight Chrome Grohtherm Single Function Thermostatic Valve Trim Only with Double Knob Handles and Volume Control - Less Rough In - Faucet.com
Grohe 47439000 N/A 1/2 Inch Shower Turbo Stat Cartridge from Grohtherm Collection - Faucet.com
GROHE Eurostyle Chrome 1-handle Bathtub and Shower Faucet Valve Included in the Shower Faucets department at Lowes.com