Home / Heating / Pyrox / Thermocouple Pyrox Mercury Cut Out 403 Thermocouple Pyrox Mercury Cut Out 403 Thermocouple to Suit most old model Pyrox heaters 304 models. Product ID: 1073A Categories: Heating, Pyrox Tag: 1073A Description Additional information Description Thermocouple to Suit most old model Pyrox heaters 304 models. Additional information PID 1073A Related products Thermocouple Braemar WF2000 30mj 611501 Gas Control Sit Quasar-N0.710.133 Switch Fan Thermostat Yellow Dot Quasar Spark Igniter & Flame Sensor