Mishimoto MMHOSE-BRZ-13RD Subaru BRZ Silicone Radiator Hose Kit, 2013+, Red Direct fit for 2013+ Subaru BRZ and Scion FR-S Inner Diameter: Hose 1: 1.55 Hose 2: 1.55 Hose 3: s.55 Hose 4: 0.3 Outer Diameter: Hose 1: 1.9 Hose 2: 1.9 Hose 3: 1.9 Hose 4: 0.52 High grade silicone and heat-resistant embedded fibers feature max temp of 330F Mishimoto Lifetime Warranty