PULSE ShowerSpas Tru-Temp Pressure Balance Rough-In Valve with Trim Kit comes in four 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, making installation easier than ever!