... Std Ref: API 5CT Grade:J55,K55,N80,L80,C90,P110, N80-1,N80-Q Type: NU, EU Descriptions and sizeType of ... pallet, or by requirements of customers Our company manufacture and sell casing and tubing couplings,pup joints, tool joints, adapter pup-joints ... , adapter couplings, stabilizers, air-liquid separators, anchors of oil pumps and revolving sand gravitated device, etc. API 5CT and 5B tubing couplings