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Amazon.com: Aupoko Patio Heater Thermocouple, Outdoor Heater Replacement Parts M8 x 1 End Connection Nuts Thermocouple 410 mm Length M6 x 0.75 Head Thread with 6.3 MM/0.25'' Flat Terminal : Patio, Lawn & Garden
Rinnai Gas Heater Thermocouple Overheat Cutout Flame Sensor Classique and Royale PN 90182190