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2-3/8" EU N80 Seamless Galvanized Tubing Coupling for Oil Gas Well Connection Cold Drawn/Precision Machined 1 Year, Find Details and Price about Casing Pipe Pup Joint Tubing Pipe Pup Joint from 2-3/8" EU N80 Seamless Galvanized Tubing Coupling for Oil Gas Well Connection Cold Drawn/Precision Machined 1 Year - Dongying Robust Petroleum Equipment Co., Ltd.