Perrin & Rowe Holborn /2" Pressure Balance Trim U.THB51W1LSPerrin & Rowe Holborn 1 2 Pressure Balance Trim U. THB51W1LS Pressure balance shower trim designed for simple, single control operation of temperature and volume. Features Single control mechanism for temperature and volume Can run a standalone showerhead or a showerhead with tub spout when the tub spout has an integrated diverter CEC compliant Solid brass construction Cartridge included with trim All necessary mounting hardware included Requires