Motor-pump units with on-board filters, featuring full or partial soundproofing, chassis mounted on two rubber wheels with built-in tank, parking feet, electric start with battery, and engine protection control unit (for low oil pressure, high engine temperature, belt breakage, and water pressure drop). Complete with pressure switch, tachometer, and hour meter, with suction and delivery flanges. On-board installation of one or two automatic 4″ or 6″ mesh filters.