The new series of Aqua metering pumps with an electric motor provides high performance, with very precise, adjustable and careful dosing. These new series have been completely designed, engineered and manufactured using only high-quality materials that are manufactured in Italy using cutting-edge CAD design. The 0-100% feed rate control is provided by a manual feed rate control that controls the stroke length. The intake stroke is operated by a spiral spring. The gear box of the pressure reducing valve is made of a closed worm wheel operating in an oil bath. The drive shaft and the eccentric shaft are supported by heavy-duty bearings.