Semi-hydraulic three-diaphragm pump, for use in low pressure systems. Parts in contact with pumped liquids in reinforced polypropylene, AISI 303/304. Diaphragms in NBR. Seals in NBR. Die-cast casing with oil-immersed mechanism and clear plastic tank for visual level checking. Remote oil tank installation kit available on request. Fitted with air-hydraulic damper for smoother operation and less hammer effect in the delivery circuit. 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. Mass-produced safety valve and cardan protection. Geomet metal fasteners. Available with reduction gearbox for electric motors or internal combustion engines, pulley fixtures or flanges for hydraulic motors.