Fitment and Product Information. Brandname: AGS Part Number: CNC-625 Product Details. AGS coils are the same copper-brazed, double-walled, steel or copper nickel alloy tubing as used in our pre-made lines. When combined with AGS tube nuts and flaring tool, 25 Foot lengths are an economical solution for shops that want to build their own lines, custom lengths or non-standard applications. Used To Fabricate Fuel And Transmission Lines. Beveled Seam Edges For Smooth, Bead-Free Joint. Perfect Flares Without Special Bending Or Flaring Tools. WARNING : This product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer.