Profile: Tuff Pumps Ltd manufactures end suction horizontal & vertical centrifugal pumps for the water, effluents, chemical, petrochemical, paper & pulp and general process industries. We also specialize in abrasive slurry and sludge pumps. The H series is a horizontal range of rugged & reliable hard metal slurry pumps in 12 standard sizes and numerous material combinations, from a minimum of ductile iron, through ni-hard, to 28 percent high chrome iron, with a BHN hardness of +/- 600. The HV Series is a vertical cantilever version for tank mounting.