Riobel Nibi 1/2" Therm & Pressure Balance Trim With 3 Functions (Share) - TNB23Riobel Nibi 1 2" Therm & Pressure Balance Trim With 3 Functions (Share) TNB23 Thermostatic and pressure balance trim with multi function shared control. Features Combines thermostatic and pressure balance technologies Set it and forget it temperature memory 3 function system with 2 dedicated and 1 shared function Allows one function independently or two functions at the same time Integrated diverter for streamlined installation Flow rate of 6. 3 GPM