The Mishimoto 7.3L Powerstroke silicone coolant hose kit is manufactured from a combination of high - grade silicone and four layers of heat - resistant embedded fibers to provide the ultimate in durability and performance.Factory rubber hoses will begin to degrade and crack with years of abuse and can cause serious overheating upon failure.Upgrading to the Mishimoto silicone coolant hose kit ensures peace of mind and improved reliability.The Mishimoto 7.3L Powerstroke silicone coolant hose kit includes our signature lifetime warranty and is available in black, blue, and red.