AN hose ends are cut from 6061 T6 Aluminum on CNC machine turning centers providing superior thread strength and smooth assembly. RHP's custom designed Hose nipples enable a quick, easy and consistent hose end assembly. Our double viton O-Ring seals provide leak free performance when used with a wide range of racing fuels and fluids. Each Fitting features exclusive hand polishing, color consistent BLACK anodizing and unique pressure testing adds the final touch of quality and protection that professional engine builders expect. No special tools required for assembly!