Direct action pump.
https://www.emergency-wash.org/water/en/technologies/technology/direct-action-pump
👉🏼 PDF: https://app.box.com/s/to7quhheui6jq5ow7bchet9mxa5so8kc _ A Direct Action Pump is a positive displacement pump that displaces a fixed amount of water per cycle. Water is lifted or displaced directly by the user without additional levers or bearings. The pump is mostly unsuitable for emergencies and should be reserved for long-term water supply in rural areas.