Use this Avantco 17813894 Carel black probe sensor to replace the sensor that came with your Avantco unit. The Carel temperature controller inside your Avantco refrigeration equipment relies on a functioning sensor to accurately read and adjust the temperature. Replace a worn or damaged sensor right away to ensure your unit is operating at food safe temperatures. It's compatible with Avantco A-12F-HC, GDC-49F-HC, and GDC-40F-HC