3/8" Aluminum Weld-On Barb Treadstone/s high performance oil and water hose fittings are cut from aircraft-grade 6061 T6 Aluminum on CNC turning machines. Our fittings provide superior strength with easy and fast assembly. High quality Viton o-rings provide a consistent and leak-free seal, even when used with racing fuels and oils. And finally, our black anodizing adds a final touch of stealth and quality that our customers expect from Treadstone Performance.