A leaking coolant hose can lead to serious engine damage if not quickly identified.Upgrade your cooling system with the Mishimoto 6.6L Duramax silicone coolant hose kit for the perfect combination of performance and durability.Mishimoto coolant hoses are manufactured with high - grade silicone and four layers of heat - resistant embedded fibers to provide increased pressure and temperature tolerance.The Mishimoto coolant hose kit is ideal for use on both stock and modified trucks for any environment or terrain.The Mishimoto 6.6L Duramax silicone coolant hose kit includes our signature lifetime warranty and is offered in black, blue, and red.