Feature●Temperature limit stop provides temperature control for safety while allowing maximum water temperature.●Provides smooth shower handle rotation●NOTE:O-ring is the key. Dont forget to put in the O-ring when installing.●It would not work when the valve cannot handle a pressure differential between hot and cold is serious.Please make sure it fits to your needs before you make your purchase.Description Compatible with Pressure Balance 1/2" Shower Valve and most shower valves,Temperature limit stop provides temperature control for safety while allowing maximum water temperature.Provide the most comfortable shower experience