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API 5CT 2 3/8" to 4 1/2" J55 L80 N80 P110 Tubing Coupling, Find Details and Price about Tubing Coupling 2-3/8 2-3/8 Coupling API from API 5CT 2 3/8" to 4 1/2" J55 L80 N80 P110 Tubing Coupling - Tianjin Dongfanglong Petroleum Equipment Manufacture Co., Ltd.