... BOPmainly used for ables during well drilling ,oil testing ,perforating, oil extraction testing. Manual single ram BOP for cableBOP Model :SFZ12-21Main ... used for sealing cables during well drilling, oil testing , perforating, oil extration testing . It is equipped with oval ram, under ... ram, slip ram and shear ram in their functions: manual and hydraulic in their forms: flange or union structures for ...