Semi-hydraulic three-diaphragm pump, for use with aggressive products in low pressure systems. Parts in contact with pumped liquids in reinforced polypropylene, Kynar and AISI 316 L. Diaphragms in BlueFlex. Seals in Viton®. Three-diaphragm design for smoother operation and less hammer effect in the delivery circuit. Die-cast casing with oil-immersed mechanism and clear plastic tank for visual level checking. Remote level monitoring sensor on request. Oil drainage stopper. Pistons with ring for a more efficient “oil cushion” system to protect the diaphragm. New-design diaphragm cut-out system to prevent contact tearing even in heavy-duty operating conditions. Spherical sector profile valves for lower flow resistance and improved volumetric efficiency. Rugged feet secured to pump casing. AISI 304 metal fasteners. Versions with Cardan shaft or cylindrical shaft with tang. Available with reduction gearbox for electric motors or internal combustion engines, pulley fixtures or flanges for hydraulic motors.