American Standard T010507.002 Green Tea Flowise Shower Trim Flatwise Water Saving 3-Function Showerhead: Saves up to 40% in water usage. Pressure Balancing Valve Cartridge: Maintains constant output temperature in response to changes in relative hot and cold supply pressure. Back-to-Back Capability: Hot and cold can be reversed quickly and easily. Ceramic Disc Valve Cartridge: Assures a lifetime of drip-free performance. Allows easy control over both water temperature and volume. For use with R120, R120SS, R125, R125SS, R127 or R127SS rough valve body - all sold separately