This Avantco A Plus 44712257496 compressor is a perfect replacement for the one that came with APST-27-8 units. It is a vital part of your unit's refrigeration system, working with the other components to help your unit dissipate heat and keep the cabinet set to the right temperature. A broken or malfunctioning compressor can prevent your unit from maintaining specifications and cause strain on other components, so be sure to replace it promptly. This item includes starter components.