API B Series Pumping Units,Pumping Units.. API B series Pumping Units is conventional walking beam pumping units, its ... PerformancesHigh reliability, simple operation, easy maintenance, long service life.Gear reducer is involute herring-bone gearing, work smoothly and reliably ... -67-366,700362725,00015B-16D-53-305,300302316,000API B Series Pumping Units,Pumping Units.. API B Series Pumping Units,