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Pipe fittings are indispensable materials in construction projects, and their quality is directly related to the quality and safety of the project. Our pipe fittings, with their excellent quality and perfect performance, have become the quality choice in the industry. We follow the national standard GB/T18742.2-2002 and provide five series: S5, S4, S3.2, S2.5 and S2 to meet different needs. Each tube is rigorously tested to the nominal outer diameter, average outer diameter and wall thickness corresponding to the tube series.