Piston-plunger suction pump.
https://www.emergency-wash.org/water/en/technologies/technology/piston-plunger-suction-pump
👉🏼 PDF: https://app.box.com/s/54gtsjnfdohaqq8eez4o0p6qbfsicike _ A Piston-Plunger Suction Pump is a positive displacement pump that displaces a fixed amount of water per cycle. All working parts are usually above ground. This type of pump can be quite common in some areas, and can be rehabilitated in emergencies to bring them back into use, though it tends to not be suitable in acute emergencies where infrastructure must be built. It is instead more suitable for long-term water supply in rural areas (or for irrigation purposes). Non-suction Deep Well Piston Pumps are described in A.4 .