Compaitble with American Standard Pressure Balance Bath/Shower R111 or R121 series valves for 1321, 1325, 1351, 1354, 1355 Series Stable Temperature Control Automatically balances pressure between hot and cold water lines to maintain consistent temperature. Helps prevent scalding and provides a comfortable and safe shower experience for all users. Reliable Construction Built-in check valves eliminate crossflow and backflow. The precision-molded ABS housing resists corrosion and mineral buildup, while the brass base and dual O-rings ensure long-term leak-free performance. Easy to Install Simply shut off the water, remove the old cartridge, and install the ALITZ replacement unit using your existing valve body. No special tools or plumber required – quick and direct fit. Premium Quality Made of durable ABS and brass components for excellent strength and longevity. Each ALITZ cartridge is factory-tested to ensure smooth operation, accurate pressure balance, and reliable sealing. Compatibility: Designed to fit American Standard Pressure Balance Shower Valve models R111 and R121, including 1321, 1325, 1351, 1354, and 1355 series. Direct replacement for 077171-0070A / M961622-0070A cartridges. Pressure Balancing Function: Maintains stable water temperature by automatically adjusting pressure differences between hot and cold supplies, effectively preventing scalding. Reliable Structure: Integrated check valves eliminate crossflow, while precision-molded ABS housing resists corrosion and mineral build-up for long-lasting performance. Easy Installation: Simply remove the old valve assembly and install the ALITZ cartridge with your existing shower valve body – no special tools required. High Quality Materials: Made of premium ABS and brass components with double O-rings, ensuring a leak-free seal and smooth operation over time.