Aspirator pump serrated outlet with vacuum inlet, 4 serrations for laboratory hose, and integral check valve | Chicago Faucets
Lab-Scale Shz-D (III) Bench Circulating Water Aspirator Vacuum Pump Used for Small Rotary Evaporator or Reaction Kettle/Reactor - China Water Circulating Vacuum Pump, Water Circulation Vacuum Pump | Made-in-China.com
GasAlertMicroClip Series Manuel Aspirator Pump Kit | Be Atex