The 5005-S hydraulic diaphragm metering pump from Neptune Chemical Pump Company can deliver repeatable flows down to quarts per day, making them ideal in oil and gas production, recovery, and in refineries. Typical applications include the injection of antifoam agents, corrosion inhibitors and other additives injected at very low volumes but high pressures. The pumps have EZE-CLEAN valves, which enable the valve cartridges to be removed for cleaning without disturbing the piping. Electronic stroke-length control is available, along with explosion-proof models that can be used in a variety of hazardous environments. It has discharge pressures of 3,000 psi. 215/699-8700; www.neptune1.com.