Semi-hydraulic three diaphragm pump, for use in the professional agricultural sector on spraying machines. Suction and delivery duct external to the pump. Parts in contact with the pumped liquids in anodized aluminum and AISI 303/304. BlueFlex™ membranes. NBR rubber seals. Die-cast crankcase with oil bath mechanics, transparent plastic tank for visual level control. Equipped with hydro-pneumatic damper for greater regularity of operation and less pulsation in the delivery circuit.