API Steel Couplings
Size: Ф4 1/2inch 5inch 5 1/2inch 6 5/8inch 7inch 7 5/8inch 8 5/8inch 9 5/8inch10 3/4inch 11 3/4inch 13 3/8inch 16inch 18 5/8inch 20 inch
Grade: H40,J55/K55,M65,L80,N80,C90,C95,T95,P110,Q125
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