Abstract: A refrigerated container having an air compressor for maintaining a controlled atmosphere includes provisions for cooling the ambient air being drawn in by the air compressor to thereby prevent corrosion in the air compressor. A condensing line heat exchanger is connected between an inlet port and the compressor and is so disposed that the evaporator fan passes air thereover to provide cooling to the ambient air passing therethrough such that condensation forms within the tube. A water separator is included in the system to remove condensate and allow the drier air to pass to the compressor. The water separator is so constructed as to allow for the free flow of air therethrough with very little restriction. A drain fitting in the water separator is so constructed as to prevent spattering that might otherwise occur.