Shop Nilight 15FT Air Line Hose Assembly Rubber Air Hose with 1/2″ NPT Swivel Fitting Straight Heavy Duty Power Hoses Set Spring Guard Grips DOT Fittings for Semi Truck Trailer Tractor in high quality, support 2 Years Warranty. Corrosion Free 360° Swivel Fitting has a longer lifespan, with SAE standard 1/2″ NPT fittings, threaded with seal glue to prevent leakage