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Tubing Pipe(Casing Steel Pipe) Type of End Finish: PNU- Plain end, non upest, extral thickness, thread and coupling. Tubing Pipe(Casing Steel Pipe) Packing: Labeled and bundled together with steel strip Tubing Pipe(Casing Steel Pipe) Application: Tubing is used for extracting petroleum and natural gas. Casing Steel Pipe serves as wall of well.