KOHLER K-304-K-NA Rite-Temp Pressure Balancing Valve Back-to-back installation is ideal for unique or high-volume jobs Provides anti-scald protection and temperature regulation at flow rates as low as 175 gpm; far below federally mandated standards of 25 gpm Large internal ports allow quick bath filling Mounting tabs located on rough-in for secure installation option Requires valve trim (sold-separately)