KOHLER K-304-UX-NA Rite-Temp Valve with Pex-Expansion Back-to-back installation is ideal for unique or high-volume jobs Matching trim for all KOHLER(R) faucet lines available Provides anti-scald protection and temperature regulation at flow rates as low as 1.75 gpm; far below federally mandated standards of 2.5 gpm Large internal ports allow quick bath filling Mounting tabs located on rough-in for secure installation option