The multi-stage hydraulic part is located on the shaft of the electric motor, cooled by the pumped liquid. Impellers and diffusers in glass fiber reinforced technopolymer with stainless steel wear ring. The pump housing, connecting pipe, suction grille and motor shaft are made of AISI 304 stainless steel. Motor support – brass. To protect the electric motor from ingress of the pumped liquid, a silicon carbide/silicon carbide mechanical seal is used on the hydraulic side and an oil seal on the electric motor side. The pumps are equipped with an asynchronous electric motor cooled by the pumped liquid. To ensure low noise levels and long service life, the rotor rotates on oversized bearings filled with grease for life. A starting capacitor unit is available upon request for models with single-phase motors and has built-in overload protection. To protect the three-phase motor, overload protection must be provided in accordance with current regulations. Single-phase models can be equipped with a built-in float switch for automatic operation.