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Pentair Max E Therm MasterTemp Thermistor (42001 0053S) chlorinegenerators 0 HP 1 1 2 inch no trap 0 HP 1 1 2 inch no trap wet end is designed for compatible pump applications where the hydraulic side of the assembly needs a more complete replacement rather than rebuilding piece by piece When hydrostatic valves must be removed without the correct tool The thermistor helps the control system read water temperature so the heater can cycle properly and maintain the selected set point This replacement is a practical option when testing confirms the sensor is out of range or physically damaged by age
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