Mr. Heater Thermocouple, 12.5 in. is crafted with durable copper construction and features milled brass fittings designed to prevent the release of unburned propane, ensuring safe and efficient operation. This tank top thermocouple is compatible with the series Mr. Heater Tank Tops, including Model Nos. F273100, F273105, F273200, F273300, F273305, F273600, F273605, and F273900. Measuring 12.5 inches in length, it provides a reliable fit for your heating needs, maintaining the performance and safety of your Mr. Heater equipment. Model Number: F273100