Dreyoo 2 Pack Pressure Balancing Unit Compatible with American Standard 077171-0070a for Single Control Bath Tub and Shower Faucets Valves

["Compatibility: this shower cartridge replacement is compatible with American Standard R110, R120, R115 and R125 series of pressure balance shower and tub control valve; Be sure to check your repair part information to ensure compatibility with your shower valve body","Application: by changing in the hot and cold water supply pressure, this pressure balancing unit helps to reduce the chance that you'll experience dramatic changes in water temperature in the shower; This allows you to control the temperature of the shower as you like and effectively prevents getting scald","Outstanding Design: the diaphragm system with integrated check valves is engineered to eliminate cross flow and this pressure balance unit is also designed to avoid failure due to mineral deposits, even when you applied this pressure balance in hard water areas","Easy to Install: please make sure the water valve is closed before installation; Remove handle and pressure balancing cartridge assembly, then you can find and replace the pressure balancing kit easily","High Quality Materials: pressure balancing unit is constructed from durable plastic, it provides a secure fit with your fixation ring, making it both practical and long lasting. The high quality sealing rings ensure excellent sealing performance, preventing leaks and ensuring reliable operation"]