These centrifugal close-coupled horizontal pumps allow the transfer, recirculation and distribution of chemicals contained in storage tanks or process vats, the loading-unloading of tank trucks, etc Their particular constructive features guarantee superior resistance to chemical aggression and an extended operating life. The horizontal OMA pumps may be provided with a base plate or trolley. Installations: flooded suction or with priming chamber (SP series). In this latter case the pump intake capacity is influenced by vapor pressure, foam, and temperature.