Photo 1 of ARU Thermal Regulator #77707-0010 is Compatible with MasterTemp 400, 250, 125, 200, 300, 333 and Sta-Rite Pool Spa Heaters SR200, SR333, SR400

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Photo 1 of ARU Thermal Regulator #77707-0010 is Compatible with MasterTemp 400, 250, 125, 200, 300, 333 and Sta-Rite Pool Spa Heaters SR200, SR333, SR400Photo 2 of ARU Thermal Regulator #77707-0010 is Compatible with MasterTemp 400, 250, 125, 200, 300, 333 and Sta-Rite Pool Spa Heaters SR200, SR333, SR400