1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, long service life pumping unit 1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, long service ... , 33, 2357,000C-57D-76-427,60042, 33, 2357,000 API Conventional Beam Pumping Unit