Simultaneously vacuum filter up to twelve samples for rapid retentate or filtrate analysis. Numbered positions on the filter plate assure accurate sample tracking. Sealing stoppers maintain vacuum on unused sample cups. Accessory extension barrels increase sample volumes from 15 to 50 mL. Components: Hand Knob, Top Plate, O-ring, Support Plate, Support Screen for 25-mm Swinnex filter holder, Valve, Chamber Inner O-ring, Chamber Outer O-ring, Drain Plug and Reservoir Chamber.