Neptune NSP Series Solenoid Metering Pumps come equipped with double-ball valves to ensure consistent and precise dosing of a variety of chemicals, including acids, alkalis, coagulants and flocculants. To adapt the dosing performance, the stroke frequency can be adjusted manually or via an external control contact for some models. The compact design and easy-to-use control of the NSP Series provide a more efficient operation and shorter setup times for the operator. The small footprint also allows it to easily integrate into dosing systems with limited space. The NSP Series is available in manually-, analog- and pulse-controlled models.