Function: AN6 Nylon braided PTFE hoses are used in a wide variety of applications, including fuel systems, cooling systems, transmission systems, turbocharging systems and more. Color: AN6 20FT. Material: The overall structure of this type of hose consists of three layers, the outer layer is nylon braided layer, the inner tube layer is PTFE Teflon material tube, and the middle layer is 304 stainless steel braided layer.