This Avantco 18937188 Carel black probe sensor and refrigerator control kit is a direct replacement for the one that came with your Avantco refrigerated air curtain merchandiser. Maintaining the correct temperature inside your refrigeration equipment is one of the most important parts of food safety, so if you suspect that your unit's controller is not operating correctly, replace it promptly to avoid any potential spoilage and lost profits. The temperature controller inside your Avantco refrigeration equipment relies on a functioning sensor to accurately read and adjust the temperature. If both of these parts are damaged or malfunctioning, be sure to replace them promptly with this kit. It's compatible with Avantco WVAC and BVAC series refrigerated air curtain merchandisers.