Neptune Models 5005-S and 5003-S Hydraulic Metering Pumps are built to deliver very low flows that are repeatable and accurate, ranging down to quarts per day. Discharge pressures are higher than mechanical metering pumps. Explosion-proof models are available for use in hazardous atmospheres.

These pumps are necessary in oil/gas production, oil recovery and refineries. Typical applications include the injection of antifoam agents, corrosion inhibitors and other additives injected at very low volumes but high pressures.