Deep well piston pump.
https://www.emergency-wash.org/water/en/technologies/technology/deep-well-piston-pump
👉🏼 PDF: https://app.box.com/s/x6071dzzfr0glp2bqb886rce94rgl2j0 ___ A Deep Well Piston Pump is a positive displacement pump that displaces a fixed amount of water per cycle. Water is lifted from depths of up to 90 metres with the aid of additional levers or gears. The pump is rarely suitable in the acute phase of an emergency and is instead better for long-term water supply in rural areas with low population densities.