NUE Tubing Coupling coupling shall be machined from the coupling blank,and made from the coupling material ,coupling stocks or hot forging. Send InquiryChat Now Product Details: 3-1/2" J55 NU Tubing coupling 3-1/2" J55 EU Tubing coupling 3-1/2" N80 NU Tubing coupling 3-1/2" N80 EU Tubing coupling 3-1/2" P110 NU Tubing coupling 3-1/2" P110 EU Tubing coupling Our Services/Warranty As a professional manufacturer, we provide follow services: 1.Lower price 2.ONE year warranty and life time maintenance 3.In time delivery. 4.High Quality assurance.. Latest news