The metering injector pump from San Diego-based Posiprime LLC is designed to mount directly into containers with 2??-diameter openings such as 55-gallon chemical drums. This ability to meter chemical directly from the original shipment containers eliminates the need to transfer chemical in many installations. The positive displacement, piston-driven metering pump has a self-priming submerged pump head. Feed rates are from 0.2 gph to 6.0 gph, and adjustments in 2-percent increments provide precise control.