API Steel Pipe Fittings 1.Grade: J55,K55,N80,L80,P110 2.OD ... .Standard: API 5CT 4.Place of Origin: China API stainlees carbon Steel Pipe Fittings ———————————————————————————————————————— Features—————————————————————————————————————————————GRADE: J55, K55, N80-1, N80- ... casing, tubing, casing coupling, pup joint, reducer union, drill pipe coupling and also can process the special specification as the ...