Work in: The 19804 shower valve cartridge assembly for single handle function repair kit, replacement for single handle 1300/1400 series shower bath tub shower faucet (For Monitor 1300/1400 series bathtubs and showers before to March 2007) Flexible Control: Built-in temperature control valve controls water temperature within a safe range of ±3.6°F to prevent scalding or chilling due to sudden changes in water temperature High Quality: Single-handle universal valve cartridge repair assembly is made of high-quality brass and engineering-grade plastic, sturdy and not easy to deform, saving half the cost Easy Installation: The RP19804 cartridge is easy to install and requires no other tools or modifications Before installing a new cartridge, remember to clean all contaminants in the area of the valve Package including: RP19804 shower valve cartridge and installation accessories (An additional set of waterproof gaskets is included) RP19804 is a factory-grade replacement pressure-balancing spool kit designed for Delta Monitor 1300/1400 Series Single Handle Shower Faucets for repairing and upgrading old or faulty cartridge. The pressure balancing technology automatically adjusts the pressure fluctuations of hot and cold water, effectively preventing sudden temperature rises or drops caused by changes in water pressure during showering, ensuring safe bathing, especially for families with children or the elderly.