... :tubing couplings Std Ref:API 5CT Grade:J55,K55,N80,L80,C90,P110, N80-1,N80-Q Type: NU ... , EU Coupling Manufacturer of Tubing and Casing coupling according to API SPEC 5CT AND 5BAPI couplings ... manufacture and sell casing and tubing couplings,pup joints, tool joints, adapter pup-joints, ... adapter couplings, stabilizers, air-liquid separators, anchors of ...