RP19804 Shower Cartridge Assembly Replacement for Delta 1300/1400 Series Tub and Shower, Fits Delta Select Monitor Valves. RP19804 pressure balance shower cartridge assembly is suitable for single-handle tub or shower trim, multi choice universal Tub/Shower 19932007, this pressure balance shower assembly doesn't fit for MultiChoice universal valves 2007 present. Please note that it's Not applicable for 13/14 series tub shower. Faucet cartridge RP19804 pressure balance shower cartridge assembly is made of high quality brass and plastic, to control the water flow appropriate and save water.Also accord with the reduction of lead in Drinking Water Act. With single-function pressure-balance temperature control keeps the water at a safe temperature for you. This RP19804 Monitor shower cartridge designs with a pressure balance to keep the water temperature within a safe range ±3.6°F (±2°C), protect you from sudden changes in hot or cold water pressure, to give you a pleasant shower time. RP19804 cartridge assembly for Delta 1300 1400 series tub is easy to install, need to clean the cartridge area in fixture and make sure new one is seated all the way in the slot, limit the maximum flow of hot water to prevent overheating easily.