Stainless steel components for durability and robustness. to increase run-time and trouble-free operation. Many design technical features make this pump range very compact and extremely reliable Three-dimensional twisted blades of the impeller and diffuser design to enhance efficiency and to reduce energy consumption. External stainless steel sleeve to improve stiffness and assure permanent alignment of all the componentsMotor adapter and discharge head may be removed without disturbing the impeller / diffuser stack. Built-in check valve and over size pump shaft. Very compact and extremely reliable to resist to the most complex and severe conditions. Easy service without the need of special tools.