Perrin & Rowe Holborn 1/2" Therm & Pressure Balance Trim With 3 Functions (Share) U.THB23W1LSPerrin & Rowe Holborn 1 2" Therm & Pressure Balance Trim With 3 Functions (Share) U. THB23W1LS Thermostatic and pressure balance shower trim with shared functionality for flexible shower configurations. Features Combines thermostatic and pressure balance technologies Set it and forget it temperature memory Supports up to 3 functions Allows 2 independent functions or both to run at the same time Can operate showerhead or handshower independently, or