This is a brand new refrigeration 3-in-1 for stack style soda machine compressors (not for glass front style). It's universal and replaces the electrical components on the compressor: the relay. the overload, and the capacitor. If any one of those components on your current compressor is bad your compressor will not start or run, and this replaces all three. Comes with instructions and an installation video is available on our website.