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, and available in your choice of black, blue, or red. Perfect for your Audi TT.Direct fit for 1999-2006 Audi TT 1.8TINNER DIAMETER: Hose 1: 1.22" Hose 2: 1.22" Hose 3: 0.59"OUTER DIAMETER: Hose 1: 1.57" Hose 2: 1.57" Hose 3: 0.91"High grade silicone and heat-resistant embedded fibers feature max temp of 330°FMishimoto Lifetime Warranty