... 100-350 mm 4,Max diameter of flowed partice;82-230 mm G(A) series Dredging Pumps G(A) series dredging pumps are international products ... channel, easy erection and so on.These pumps are built of wet end, shaft seal, bearing assembly, base (or gear ... impeller, casing, door and back liners are cast of anti-abrasion alloy of a hardness above 58HRC.Defination of models; G(A) series Dredging Pumps