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Specification: 1.900 "2-3 / 8" 2-7 / 8 "3-1 / 2" 4 "4-1 / 2" Steel grade: J55 / K55 n80-1 / n80-q l80-1 P110, etc Buckle type: eue thickened oil pipe coupling Main parameters: the product complies with API 5CT / 5B standard.
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