Dr. Andreas Frerix is the Product Management Director for Quattroflow and can be reached at [email protected]. Quattroflow is a leading brand of quaternary (four-piston) diaphragm pumps that primarily serves industries such as pharmaceutical and biopharmaceutical that require gentle displacement, reliability, product safety, purity and cleanability. Headquartered in Duisburg, Germany, Quattroflow is part of PSG, a Dover company.