Mishimoto MMHOSE-CHV-06DBL Chevrolet/GMC 6.6L Duramax Silicone Coolant Hose Kit, 2006-2010, Blue Direct fit for the 20062010 Chevrolet/GMC 6.6L Duramax INSIDE DIAMETER: Hose 1: 2.44" (at ends), 1.97", 1.00", .67" Hose 2: 1.77" OUTSIDE DIAMETER: Hose 1: 2.80" (at ends), 2.44", 1.38", 1.1" Hose 2: 2.17" 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