Semi-hydraulic double diaphragm pump for garden or semi-professional agricultural sector. In combination with an electric or petrol engine on a gardening trolley, a small sprayer treated with medium pressure plant protection products in a garden, greenhouse, orchard or vineyard. Components in contact with the pumped liquid shall be aluminum oxide and AISI 303/304. NBR membrane. Seals in the NBR. Die-cast cart with oil bath mechanism, clear plastic fuel tank for visual level control. Hydraulic pneumatic dampers are provided to improve the regularity of operation and reduce pulsation in the transmission circuit. Segmented pistons increase the efficiency of membrane protected "oil pad" systems. The screws are galvanized.