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 Knob Control 49s Burwood Heaters Switch Fan Thermostat Yellow Dot Quasar Flue Fan TB Series TB90 620510 Thermocouple Screw Type 600mm