4 Inch Borehole Pumps

A 4SD pump name tells you two things: 4SD6/7 means a nominal flow of 6 m³/h (6,000 litres an hour) with 7 impeller stages. More stages means more head: the 4SD6/5 lifts 36 m and the 4SD6/7 lifts 50 m at the same flow. Choose the flow first, then the number of stages that gives you the head you need.
Flow: stay below the borehole yield from the driller’s test. 2–3 m³/h pumps suit most homes; 4–8 m³/h for irrigation and livestock; 10 m³/h and up for farms.
Head: pumping water level + height to the tank + friction + any pressure you want at the tap. Pick the pump whose curve delivers your flow at that head, not the one whose “max head” merely exceeds it.
Power: 0.25–1.1kW on 220V single-phase for homes; 1.5kW and up usually on 380V three-phase. Single-phase motors need a control box with a start capacitor.
Cable and pipe: use our cable sizing chart for the drop cable, 32mm or 40mm HDPE rising main for most 4″ pumps, and a stainless safety rope.
Fit a non-return valve above the pump, dry-run protection such as a Motorscope or a float in the borehole, and install the pump at least 3 m above the bottom of the hole and below the pumping water level.

How deep can a 4 inch borehole pump go?
The 4SD range covers heads from about 30 m to well over 200 m depending on the model, so most domestic and farm boreholes are covered. Tell us the depth and we will match the stages.
What is the difference between 4SD and 4ST?
Both are stainless-steel Vega 4″ pumps with a different flow and stage line-up, and both fit standard 4″ NEMA motors. Tell us your yield and head and we will pick the one whose curve fits best.
Can I buy just the pump end if my motor is fine?
Yes. 4″ pump ends and motors use the standard NEMA coupling, so you can replace one without the other. See our borehole motors category.
Do you deliver nationwide?
Yes. Complete 4″ sets are couriered across South Africa. For sizing, send your driller’s report to WhatsApp 061 744 1001.