Silicone heater hose is a substantial upgrade from standard rubber OEM heater hoses.  With a single ply of nylon reinforcement, silicone heater hose is extremely flexible and the perfect hose for high temperature coolant applications.  Silicone will resist cracking, hardening, cold leaks, aging, and many chemicals.  Ideal for extreme temperature and various pressure ranges where high performance levels are required.  Stocked in ¼” through 1 ½” sizes.