They are also easy to disassemble for quick, frequent maintenance and practical to use in the wheeled version, with the electrical system, reverse gear and emergency button on board. They are fitted with standard motors with fixed speeds of 1400, 900 or 700 revolutions per minute and can be equipped with a speed variator or servo-ventilated motor for inverter application. The 'AC' series includes models with flow rates from 540 to 24,000 litres/hour and up to 3 atm of head pressure. The standard connections are for hoses, but can be fitted with another type of connection by request.