brand new, tag says t8205 h 1004. unit has the following connectors on it: 24 vac com, n.o. 24 vac hot, pot 1, pot 2, c , sen, sen, n.c. pot 1 and pot 2 connect to the temperature control potentiometer, the two sen connectors are for a thermal sensor, and the no c nc are for connecting to the pump / heater control relay. directions say the pot is a 10k ohm unit, says sensor is an ntc thermistor. These are part of the Jandy R0011700 T8205C1005 pool heater assembly. Obsoleted part, when these are sold out they will no longer be available.