Thanks to its upright construction, the unit takes up less space than a conventional machine and is easier to maneuver, especially up and down stairs. Its large diameter, tubed pneumatic tires ensure maximum mobility even over difficult terrain. The easy-press trigger gun is comfortable, requiring less effort to hold and operate, and features a servopress controller for convenient adjustment of pressure and water flow rate. The built-in detergent tank has a capacity of 1.5 gallons. Features: - Robust, three-piston axial pumps features detergent-resistant brass cylinder head and stainless valves; pumps is protected by pressure switch and over flow valve - Low-speed, 4-pole, air-cooled motor runs quieter and cooler than conventional motors thus prolonging its service life - EASY!Force gun with cruise control like technology uses its own recoil force to hold the trigger down, so no more sore hands after hours of use.