The AID hand pump is a single-action, reciprocating, positive displacement pump designed in 1966 by Battelle-Columbus Laboratories for the U.S. Agency for International Development (AID). Specifications for the design included long life under severe operating conditions, easy maintenance using simple tools and unskilled labor, potential for manufacture in developing countries, ar,1 easy operation by women and children. The shallow-well (SW) version, with though, piston and cylinder assembly incorporated into the above-ground pump stand, is suitable for wells where groundwater is located at depths of less than 26 feet. For the deep-well (DW) version, the piston and cylinder are positioned below the water level allowing pump operation to depths in excess of 100 feet. Because of the comprehensiveness of AID hand pump programs, which include the local manufacture of pumps and spare parts and depend upon local technicians for installation and maintenance of the pumps and sometimes users for monitoring them, the programs have met with varying degrees of success around the world.