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The designed pump consisted of an Iroko wooden wheel of diameter 320 mm and a rubber tubing of internal diameter 4 mm placed round the periphery of the wheel and a metal roller fixed on a metal plate handle. Laboratory evaluation using patternator revealed that even spray volume distribution with coefficients of variation of 46.7, 48.3, 16.9, and 37.6% at target heights of 150, 300, 450, and 600 mm respectively. Droplet spectrum analysis using conventional microscope fitted with a graticule (Porton G 12 type) yielded average volume and number median diameters of 250 and 225mm respectively with average dispersion ratio of 1.11. These results indicate that, the pump can be employed for precise herbicides chemical spraying. Cost of production of the pump is low and it has a precise measuring capability. Volume distribution uniformity and droplet spectrum analysis results indicate that, the pump is viable for sustainable agricultural development in arid and semi arid regions of third world countries. The pump when coupled to a ground wheel device, variable metering of spray in relation to speed of movement could be achieved. These advantages lead to a meaningful economic gain and protection of the environment in terms of initial pump cost and savings in chemical spray.