Tectran MAGNUMFLEX-HD Dual-Line Aircoils ? All the same protective armor coating as the ARMORFLEX-HD line with the added benefit of Fused Technology bonding the lines together into one single unit. This Fuse Technology allows for the most tangle free, coiled tractor-trailer connection system in the industry! Tubing features polyurethane covered Armor Coating that is rugged, abrasion and cut resistant -85°F extreme cold flexibility rating Unique manufacturing process ensures outer jacket maintains permanent bond with inner tubing Made with premium, unprocessed virgin nylon constructed tubing TECTRAN’s Anti-Sag and Stretch manufacturing & coiling process DOT brass fittings with TECTRAN identifier Heavy duty plated, corrosion resistant spring guards Spring guards closed coils extend well past 2” from fitting, exceeding DOT regulations 1/2” tube O.D. Fittings: 1/2” LIFESwivel tractor fitting thread, 1/2” FLEXGrip-HD thread Exceeds DOT FMVSS 106 - (49 CFR 571.106 & 49 CFR 393.45) FLEXGrip-HD - Premium, thermo-elastomeric gladhand grip (Patent Pending) Tapered handle flexes with air lines during tight turns Thicker at the fitting for kink protection during gladhand connections Corrosion resistant, all brass fittings Allows gradual bend restriction during tight turns Color-coded grip helps minimize incorrect tractor/trailer connections LIFESwivel - A live swivel design featuring all brass construction to eliminate corrosion (Patent Pending) Fitting located on the tractor end of the coil Double O-ring leak-free “Life” design Quick & easy single wrench installations