Replacement Junior Koby Carbon Exhaust FilterCarbon Exhaust Filter for Vacuum Pumps Replaces Koby Junior (US Patent# 3169112A) This filter for your vacuum pump 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