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J55/K55 steel pipes Description 1)Sizes (O.D. x W.T): from 2 3/8"-4 1/2" X 0.167"-0.63" 2)Stanard: API SPEC 5CT. 3)Steel Grade:J55, K55, N80,L80-1,P110 4)Surface: Varnish or black painted to prevent ...