This 17 Series Monitor bathtub and shower cartridge replacement kit makes DIY repairs a quick and easy task. Replacement part can be installed without going behind the wall, thereby minimizing repair costs. Monitor dual-function pressure-balance cartridge For Monitor 1700 series bathtubs and showers (before March 2006) Allows for separate volume and temperature control Maintains a balanced pressure of hot and cold water even when a valve is turned on or off elsewhere in the system Genuine DELTA repair part DELTA Monitor 17 Series Cartridge Assembly Kit