A device provided to remove moisture from compressed air produced by a compressor. If moisture is allowed to pass into pipework, it collects in valves and systems, reducing efficiency and causing rust. Some older systems collected so much moisture than up to 20 gallons of water could be drained from a train. To remove it, an old oil drum was wheeled under the train and the main reservoirs drained directly into it. In days gone by, a main air reservoir under a vehicle could collect so much condensate (water) that a sharp frost could cause it to freeze and expand sufficiently to split the tank.