Liquid water
Air exiting the compressor outlet will contain water vapor, but as the air cools, the moisture condenses. The amount of water vapor in any given volume of compressed air is directly proportional to the air temperature and inversely proportional to the pressure, so there is more liquid water when the temperature is lowest and the pressure highest. This is the point where removing it is the most efficient. An aftercooler should be used to cool the air coming out of the compressor to within 8? C of the temperature of the water entering the after cooler for most efficient water removal.

At this point, the outgoing air should be piped to a receiver in the coolest location available, definitely not within the compressor house itself. Further cooling