The AC-powered Dometic Passagemaker AC425 - 115 V/60 Hz/1-Ph condensing unit has hermetically sealed compressor for quiet and efficient operation. Passagemaker units effectively chill one or more cooling boxes of virtually any configuration. These condensing units have a small footprint for installation in tight spaces. The electrical box can be mounted remotely. The chassis has vibration-isolation mounts to limit vibration transmission to the mounting surface. The compressor is also attached to the chassis with vibration-isolation mounts, limiting the amount of noise generated. The filter is replaceable without any loss of refrigerant charge, and the sight glass lets you monitor the system's refrigerant charge.