Classic, slow speed pumps (1450 RPM) with single or multiple stages for various demands in pressure (low or high head). The pumps are manufactured under strict specifications and are individually controlled for their quality. There is no need to use an one way valve in the suction end and their working life is excessively long due to the low revolutions per minute. For standard applications, the pumps are manufactured with bodies from cast iron and impellers from phosphoresced bronze on inox shafts. For special applications, such as sea water pumping or rare acids, the bodies and impellers of the pumps are manufactured completely from phosphoresced bronze on crome-nikel 18/8 shafts.