This Avantco 19386390 defrost probe is a direct replacement for the one that came with your Avantco display case. It is a vital part of your unit's refrigeration system, working to help your unit maintain the right temperature. A broken or malfunctioning probe can prevent your unit from maintaining specifications and cause strain on other components, so be sure to fix it promptly. It's compatible with Avantco BC, BCF, and BCT series display cases.