This unit can be used and installed on oil filled pump assemblies, transformers and gearboxes to remove dust particles and moisture from the air as the component heats up and cools down. They provide the optimal industry solution to contamination control. The air is filtered at the source of contamination in the filter/breather cap. The air filter and water vapour removal system prohibits entry of contaminants by replacing the standard breather or vent cap on hydraulic reservoirs, gearboxes and storage or process tanks.