Mishimoto ChevroletGMC 6.5L diesel coolant hoses are made from a combination of high - grade silicone and four layers of heat - resistant embedded fibers for an ideal replacement of the factory hoses.The Mishimoto silicone coolant hose kit is precision engineered to retain perfect factory fitment for ease of installation.Mishimoto silicone hoses provide increased pressure and heat tolerance for years of reliable service.The Mishimoto silicone coolant hose kit includes our signature lifetime warranty and is available in black, blue, and red.