Erik Solfelt is the Diaphragm Pump product manager for Wilden, Grand Terrace, California, a leading manufacturer of air-operated double-diaphragm (AODD) pumps. He can be reached at (909) 422-1741 or [email protected]. Wilden is a product brand of PSG, Oakbrook Terrace, Illinois, a Dover company. PSG is comprised of several leading pump companies, including Abaque, All-Flo, Almatec, Blackmer, Ebsray, EnviroGear, Griswold, Mouvex, Neptune, Quattroflow, RedScrew and Wilden. Find more information at wildenpump.com and psgdover.com.