This is a Balboa Temperature & Hi Limit Combination. This is a standard part and fits most Balboa 4 pin applications that are non M-7. It features a 4 pin connector will Curley Finger style ends and the Temperature Sensor Cable is 96" long and the Hi Limit is 31". The Temperature Sensor is usually Mounted in a Thermowell that is Mounted in the Hot Tub Shell and the Hi Limit is Mounted to the heater tube or Body. Though Unusual there are systems where both sensors are mounted to the heater (Not M-7)by way of a thermowell or a Pinch plate on the Heater Tube or Body.

NOTE: Whe replacing the Temperature Sensor if it is in a wall mounted thermowell, water will come out when you pull the sensor out so be careful. Make sure you are Qualified to service the Hot Tub before you begin.

EXTRA INFORMATION: This Sensor set is rarely bad. Though they can fail, if you are getting a SN code it could be a Cut in the wire from a critter or a loose connection at the board plug and if you are getting a OH Code it could be a Pressure Switch stuck closed, a Relay stuck closed on the board a restriction on water movement through the heater and even a few other things so diagnose your tub don't guess. We don't take returns on used electrical parts. Know Before you Go! Sensor Application Spa Control Sensor Type Temp and Hi Limit Application Balboa Water Group Model Balboa 4 Pin Connector Type 4 pin Sensor Diameter 3/8" & 1/4" Wire Count 2 wire/2wire Wire Length 31" & 96" Sensor Application Spa Control Sensor Type Temp and Hi Limit Application Balboa Water Group Model Balboa 4 Pin Connector Type 4 pin Sensor Diameter 3/8" & 1/4" Wire Count 2 wire/2wire Wire Length 31" & 96"