Pentair Pentair 42001-0053S Electrical Systems Thermistor Replacement Pool and Spa Heater

Size:2.5 - inch This thermistor is designed to use with Pentair Sta-Rite Max-E-Therm pool and spa heaters electrical system and also compatible with Pentair MasterTemp pool and spa heaters electrical system. Measures 6-inch length by 6-inch height by 6-inch width.