... 2)simple operation 3)easy maintenance 4)long servicing API B series Pumping Units is conventional walking beam pumping units, it ... -647,60064,5480,0003B-80D-133-5413,30054,4180,0004B-80-119-6411,90054,4180,0005B-80D-76-547,60054,4180 ... ,70036,2725,00015B-16D-53-305,30030,2316,000 API B Series Pumping Units