This is a Balboa Temperature & Hi Limit Combination. This is a standard part and fits most Balboa 4 pin applications that are no M-7. It features a 4 pin connector will Curley Finger style ends...
This Temperature Sensor Set has 1/4" probe widths on both probes.. This set usually found on tubs with no heater that uses a firestick or heat jacket to heat not a real heater... I have seen these on...