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The Product Standard: API SPEC 5CT9thPSL1; PSL2; PSL3; Size:1"9~20" Grade:H40,J55,K55,N80,L80,R95(C95),T95,P110,Q125 Hot Sale! API 5CT OCTG Female Shaft coupling N80/L80 1.Std :API 5CT &5B 2.Size : 1...