Michael P. Cresap is vice president technical services manager of PPC Mechanical Seals Inc. He joined PPC Mechanical Seals in 1973 and has worked in engineering in various capacities, including engineering manager. His current responsibilities include technical support for sales, research and development, and training. He is also involved with pump/original equipment manufacturer for application engineering. He was the team leader that developed the seal design for this article. Cresap may be reached at 1-800-731-7325 or mcresap@ppcmechanicalseals.com. For more information, visit ppcmechanicalseals.com.