The horizontal centrifugal pumps made in resin are highefficiency pumps operated by an electric motor in direct drive (max. 3000 rpm) for rapid transfer and/or emptying of fluid, with a flow rate of from 5 to 55 m3/hour. The particular open rotor construction allows fluids, even when very dirty, with an apparent viscosity of up to 500 cps (at 20°C) and with small sized suspended solids, to be pumped with a continuous flow. Two versions are available with different internal mechanical seals according to the service.