Submersible centrifugal pump with liquid vortex cast steel impeller (technopolymer impeller for Feka VX), suitable for pumping sewer water and waste water in general containing solids up to a maximum size of 50 mm. Handle with insulating rubber cover. AISI 316 stainless steel drive shaft. Double mechanical seal with intermediate oil chamber (atoxic oil), in carbon/alumina on the motor side and silicon carbide/silicon carbide on the pump side. VS version: Stainless steel pump casing, seal cover, motor casing VX version: Technopolymer pump casing with threaded metal insert inserted into the delivery port, stainless steel seal cover, motor casing. Dry, asynchronous, sealed and cooled by the pumped liquid. Rotor mounted on greased for-life ball bearings, oversized and selected to guarantee greater noise reduction and duration. Thermo-amperometric protection as standard for single-phase version, and the user’s responsibility for the three-phase version. Constantly active capacitor on the single-phase