PULSE ShowerSpas 3003-RIV-PB-MB Tru-Temp Mixing Valve, Pressure Balance Rough-In Valve Trim Kit, Square, 1/2" NPT, Matte BlackPULSE ShowerSpas Tru Temp Pressure Balance Rough In Valve with Trim Kit comes in three beautiful finishes to match any PULSE retrofit shower system. This valve utilizes a pressure balancing mixing cartridge to ensure constant water temperature in response to changes in water pressure (e. g. flushing a toilet). The valve also comes equipped with an adjustable Hot Limit Safety Stop to reduce risk of scalding. The Plaster Guard is to be used as a guide,