Replacement Stack Flu Sensor 42002-0024S designed with American Engineering Built with pristine heavy duty material Designed to fix multiple error codes including E-02, E-05 and E-06 This sensor is designed to fit into all Mastertemp Pool and Spa Heater Electrical Systems and Sta-Rite Max-E-Therm Heaters. This product an advanced aftermarket replacement manufactured by Sina Industries Inc. Replacement Stack Flu Sensor 42002-0024S designed with American Engineering. Built with pristine heavy duty material. Designed to fix multiple error codes including E-02, E-05 and E-06. This sensor is designed to fit into all Mastertemp Pool and Spa Heater Electrical Systems and Sta-Rite Max-E-Therm Heaters. This product an advanced aftermarket replacement manufactured by Sina Industries Inc.