The india mark iii deep well hand pump that we make has got cylinder with 63.5 mm i.d. And can accommodate 65 n.b.g.i. The advantage with this type of pumps is that the plunger and foot valves are extractable without removing riser pipe and cylinder body. The pumps can be set up to a depth of 45 m and so can be used in places where water level is very low. We also provide modified pumps that have 50 mm bore and 50 mm n.b. Riser pipe. These pumps are long lasting as they are corrosion resistant.