Single connector to the circuit board with two sensors, the larger temperature 3/8 sensor goes into the spa and the smaller 1/4″ high limit sensor goes into the heater back. Used with systems such as M3TUV, Lite Leader and 2000 Value series including 2005LE with pressure switch.

The big sensor is reads the temperature and goes into the spa and the small one is the high limit which goes into the back of the heater

The 2 probes slide in to their holders and the flat plastic plug plugs straight on to the PCB