7 Centrifugal pumps and graphite composite component parts sold in connection therewith, namely, pump impellers, casing rings, wear rings, bushings, guide bearings, diffusers, back plates, base plates, pump casings, non-metal non-insulating sleeves used in conjunction with the pump shaft and for impeller positioning, and valve discs for liquid valves; suction pump component parts, namely, suction bells; pump impellers; piston rings, namely, packing rings for liquid systems in reciprocating pumps; machine parts, namely, bushings and guide bearings, all for use in centrifugal pumps; valve components being parts of reciprocating pumps, namely, valve discs for liquid valves in reciprocating pumps; replacement parts for centrigiual pumps, all made of graphite composite, namely, casing rings, wear rings, lantern rings, back plates, pump casings and base plates