Mishimoto Blue MMHOSE-RAM-03DBL Dodge 5.9L/6.7L Cummins Silicone Coolant Hose Kit Direct fit for the 20032010 Dodge 5.9L/6.7L Cummins INNER DIAMETER: Hose 1: 1.6&1.8" Hose 2: 1.8" OUTER DIAMETER: Hose 1: 2.0&2.2" Hose 2: 2.2" 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 03-04 Dodge Ram with 5.9L Cummins Engine