... injecting liquid to cool down, this reduces discharged air temperature and makes the operation much more reliable.Accessories ... NJ-BF5.0Z:Copeland semi-hermetic piston compressor, oil separators, air-cooled condenser, axial flow fan, liquid reservoir, filter drier ... NJ-BF25Z:Copeland semi-hermetic piston compressor, oil separators, air-cooled condenser, axial flow fan, liquid reservoir, filter drier, ...