Audi TT Silicone Radiator Hose Kit Mishimoto radiator hose kits are made with a dual layer combining high grade silicone and heat-resistant embedded fibers to provide efficient heat reduction and increased pressure tolerance, all with an OEM replacement fit. Perfect for your Audi TT. Tech Specs: Interior Material - Heat-Resistant Embedded Fibers Exterior Material - Silicone Max Temperature - 330 F Inner Diameter - Hose 1: 1.22" - Hose 2: 1.22" - Hose 3: .59" Outer Diameter - Hose 1: 1.57" - Hose 2: 1.57" - Hose 3: .91 Choose your color with the drop-down menu below Application Guide: Audi MKI TT (99-06)