Anti-scald protection
Bottom valve is a Thermostatic mixing valve that maintains a constant water temperature automatically, regardless of incoming hot & cold water pressure & temperature. Set valve to desired temperature & no need to adjust further
Thermostatic valve with built in diverter/shut off for easier installation and clean appearance
Top valve is a two way diverter that consists of inlet for water, two outlets, & a shared function (see J-20687 for operation)