Millipore Vacuum Filtering Side-Arm Flask1L, New Threaded side-arm with quick vacuum disconnectThese side-arm flasks are designed for use in vacuum filtration procedures with classic Millipore Glass Filter Holders. This item is an accessory item for multiple kits.Features & Benefits:. Side arm connects to vacuum source with 3/8 in. I.D. hose. 1 L and 4 L flasks accept No. 8 perforated stopper. 125 mL flask accepts No. 5 stopperApplications:Vacuum Filtration Using Classic Filter Holders