Balboa sensor assembly with four (4) pin 400782 plug connector and two (2) sensors for temperature and hi-limit. This sensor assembly is not a universal fit, it only works with the Balboa controls listed below.
 
Details:
Balboa P/N 30278
Genuine Balboa part
Cord length temp sensor: 96"
Cord length Hi-limit sensor: 31"
Sensor diameter: Temperature 1/4"
Sensor diameter: Hi-limit 1/4"