Aspirators use a small jet pump that creates a vacuum suction to remove liquids. This process is done by the Venturi effect as the fluid flows throw a tube, the fluid contracts and expands creating a pressure vacuum.
Bel-Art Original Vacuum Aspirator Collection System, 1.0 Gallon Bottle with Pump (Each)
Bel-Art HiFlow Vacuum Aspirator Collection System, 1.0 Gallon Bottle with Pump (each)
Accuris Instruments Eight Channel Adapter, Fine Stainless Steel Tips, for use with Aspire V0020 Aspirator