Des-Case's desiccant breathers incorporate a high-efficiency filter to help sustain cleanliness levels by preventing the ingression of even minute particulate matter. Water adsorbing silica gel creates low relative humidity levels in the headspace to make condensation and absorption by the lubricant unlikely. Standard Features: 1 inch NPT or bayonet flange adapter Multi-tiered filtration process Filter element captures particles at 3-micron absolute Filter media changes color to indicate need for replacement Rated for 20 CFM Multiple sizes available