T-O-D Single-Pole Lower Thermostat for Residential Electric Water HeaterThe Everbilt T O D style Single Pole Lower Thermostat is ideal for use in 2 element residential water heaters and can replace APCOM style thermostats. These water heaters often have a "non simultaneous" design, which means only one element is on at any given time. This thermostat has a temperature sensitive bi metal disc to deliver snap action to the contacts. California residents see Prop 65 WARNINGS Fits most brands: Rheem, Ruud, Richmond, GE,