Annovi Reverberi 3-piston alternating volumetric pumps for use on cleaning units and industrial systems. Pump body and cover in die-cast aluminium alloy. Rear cover with oil drain outlet and oil sight glass. Cap with dipstick for oil level on body pump. Pistons driven by crank-connecting rod mechanism. Pump shaft in pressed high-strength steel. Oversized friction bearings. Connecting rods in bronze. One-piece ceramic pistons. Pump head in nickle-plated brass. Double gasket sealing system. Intake and delivery valves have plugs for easier maintenance.