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Mandrel hanger and slip hanger can be installed interchangeably to handleany emergencies while the flage housing remains unchanged.By removing the wear-resistance sleeve,operation procedures can be simplified and time is saved.After the well completion,Christmas tree can be connected to the female thread of oil reservoir hanger or steel seal ring groove with standard end face API 6A,to reach all metal sealing isolation in high and low pressure and to avoid the aging rubber parts.
