Carbon Exhaust Filter with KF25 ConnectionsCarbon Exhaust Filter for Vacuum Pumps Replaces Koby Junior (US Patent# 3169112A) This filter will adsorb contaminants such as oil aerosols, oil vapors, certain other hydrocarbon vapors, and trace moisture. They also trap all foreign solid particles and bacteria down to 0. 5 microns in size. Key Features: Purifies Exhaust Gases from Vacuum Pumps Up to 19 CFM 0. 5 Micron Filtration levels. Helps Maintain Safe Working Environment Adsorbs Organic Vapors