Self-priming electric pump for swimming pools, with built-in pre-filter. Pre-filter with transparent lid in polycarbonate which allows easy observation of the pre-filter basket. The pre-filter is closed by means of a thread, ensuring the perfect adjustment of the lid. Pump body made in polypropylene reinforced with fibreglass, resistant to the chemical products in the swimming pool, guaranteed to last a long time. Pump body lid and diffuser in Noryl. Impeller in Noryl with shaft in stainless steel. Mechanical seal in graphite and ceramics. Motor shaft manufactured in stainless steel AISI 316L. Enclosed motor, totally silent, with IP-55 protection, at 2.850 r.p.m. Tension of mains feed at 230V-50Hz single-phase or 230/400V-50Hz three-phase. Possibility of 60Hz upon request. Connections of suction and return at 2 ¼” for Ø 50 mm bush connections. Bush connections included with the pump.