Air Breathers stop airborne dirt from entering the reservoir as the oil is removed. They allow the reservoir to breathe with clean, filtered air as the oil level changes. Standard Features -- Compact Inlet Filters: Fully drawn weatherhood -- no welds to rust or vibrate apart Low entry velocity air gap between base and cover Heavy gauge base with low pressure drop outlet pipe and center bracket design Durable carbon steel construction with powder coat finish Interchangeable elements Center bracket located for minimal flow restriction Standard Features -- Elements: Polyester Washable with lukewarm water and mild detergent Less maintenance due to longer durability Moisture resistant Handles hot air and oil mist from unload cycle of reciprocating/piston compressor Reinforced with epoxy coated steel wire on both sides of cloth 99% removal efficiency standard to 5 micron Paper Higher efficiency than many alternative media Heavy duty industrial strength paper surrounded by heavy gauge galvanized expanded metal 99%+ removal efficiency standard to 2 microns Wire Mesh Handles hot air and oil mist from unload cycle of reciprocating/piston compressor More durable than paper media Moisture resistant Epoxy coated wire mesh pleated media