A 15-foot red and blue air coil set built for extreme cold weather conditions, featuring jacketing that resists fractures and abrasion while maintaining a durable rubber feel and excellent recoil memory even in low temperatures. The large coil diameter helps prevent kinking and improves recoil, with 1/2" NPTF fittings on the ends. It meets DOT 49 CFR FMVSS 393.45 and FMVSS 571 specifications. As with standard air coil sets, it provides the paired service (blue) and emergency (red) air brake lines between a tractor and trailer, built specifically to hold up in cold-climate operation where standard rubber coils can stiffen or crack.