Mishimoto MMHOSE-GTO-05RD Pontiac GTO Silicone Radiator Hose Kit, 2005-2006, Red Direct fit for 20052006 Pontiac GTO INNER DIAMETER: 1.35" OUTER DIAMETER: 1.7" Maximum Temperature: 330F Constructed with high grade silicone and heat-resistant embedded fibers Mishimoto Lifetime Warranty