This vacuum chamber air filter is designed to be used with Best Value Vacs, SVac, and Glass Vac vacuum chambers. It easily threads into the Female NPT side of the valve manifold and protects the contents inside of the chamber from having dust be sucked back into the chamber when vacuum is released because it will filter the incoming air. Quality replacement parts & fittings for vacuum chambers. | BVV Vacuum Chamber 50 Micron Air Filter