... 3. simple, stable, convenient, long service life pumping unit 1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3 ... .5. Lubrication grease is supplied by central lubrication system, reducing manual maintenance.6. The unit has comprehensive safety protection, the ladder ... , 33, 2357,000C-57D-76-427,60042, 33, 2357,000 API Conventional Beam Pumping Unit