Mishimoto MMHOSE-CHV-01DBL Chevrolet/GMC 6.6L Duramax Silicone Coolant Kit, 2001-2005, Blue Direct fit for the 20012005 Chevrolet/GMC 6.6L Duramax INNER DIAMETER HOSE 1: 1.65", 2.05", 0.95", 0.55" HOSE 2: 1.70" OUTER DIAMETER HOSE 1: 2.05", 2.45", 1.35", 0.95" HOSE 2: 2.10" High grade silicone and heat-resistant embedded fibers feature max temp of 330F Mishimoto Lifetime Warranty Interior material: Heat-resistant embedded fibers Exterior material: Silicone Maximum temperature: 330 degree fahrenheit Fits 01-05 Chevy Trucks with 6.6L Duramax engine and 01-05 GMC Trucks with 6.6L Duramax engine