NP-AH(R) Ultra Heavy Duty Slurry Pump Naipu® NP-AH(R) series centrifugal slurry pumps and spare parts can fully interchange with world famous brand.These pumps are of heavy-duty construction, designed for continuous pumping of highly abrasive and corrosive slurries. They feature a wide choice of replaceable abrasion resistant metal or moulded elastomer casting liners and Impellers, which are all interchangeable within a common casting assembly.