Check the listing for details. 24" Temp/Hi Limit Sensor for Balboa Spa Heater M7 System, 1/4" Sensor Diameter. Condition: New. Listed at 47.99 USD. 【Function】Temp/Hi Limit Sensor serves as a safety device, monitoring and regulating the temperature of our spas. Once overheating spa issues occur, it shuts off the heater. Therefore, if you are experiencing any spa temperature issue, don’t wait to get this Temp/Hi Limit Sensor to resolve it. Very sure this sensor will effectively prevent water from becoming too hot and better improve your spa experience. 【Fitment】Will fit for Balboa Spa Heater M7 System 30344 30042 30382. Also will replaces 304988, 32016, 34-0202-K, 34-0202A-K, 52016, 53605, 9711-101, 9711-109, 9713-101, BAL32016, BB32016, BX9983, RME-30344A 【Signs】When you have spa trouble codes as follows: Sn, SnA, Sn1, Sn2. Sn3, HL, EO, E2, E3, Prh, Prr, very likely there is something wrong with your sensor. Check it 【Smart M7】Highlights its function of reliably monitoring spa water and core temp, which not only protects your spa from being too hot but also eliminates frequent cycle of your pump motor. All in all, it will earn your lower operating cost and longer pump life. 【Specification】Sensor Diameter: 1/4"; Connector Type: 2 pin 【Easy Installation】1) Slide the sensor probe to the sensor housing mount and then tighten the plastic nut; 2)plug the 2-pin connector into PCB.