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Flexi-Emas pump
These hand pumps, made of PVC or polyethylene pipe, are easy to build and adjust by cylinder diameter to control the pressure and amount of water pumped. Known as EMAS or Flexi pumps, they are adaptable and originated at the Mobile School of Water and Sanitation (EMAS) in Bolivia.
1- https://www.mag.gob.sv/wp-content/uploads/2021/06/21bomba-flexi-emas.pdf 2- https://tadeh.org/documentacion/ManualEMAS.pdf 3- https: //watersystemsandsanitationparaeldesarrollo.files.wordpress.com/2013/07/mbombamanual.pdf
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