The Dayliff DSD 3/7 is a very popular entry-level submersible borehole pump in the Kenyan market, specifically designed for small-scale water supply from deep wells and boreholes.
The model nomenclature means:
DSD: Dayliff Submersible Deep-well.
3: Denotes the pump’s nominal flow rate in $m^3/\text{hr}$ at a certain head (e.g., $3 \text{ m}^3/\text{hr}$ at $20 \text{M}$ head).
7: Refers to the number of impeller stages, which dictates its maximum pressure (head) capability.

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